-Able vs -Ible Endings | Which Is Correct?

⚖️Spelling Rules

-Able vs -Ible — Which Ending Is Correct?

Is it ‘comfortable’ or ‘comfortible’? ‘Responsible’ or ‘responsable’? The -ABLE vs -IBLE ending is one of the trickiest spelling choices in English. There’s no perfect rule, but there IS a helpful pattern that works most of the time!

Quick Guide: If the root is a complete word → usually -ABLE (comfort→comfortable). If the root is NOT a complete word → usually -IBLE (vis→visible). This works ~80% of the time. This page covers all 50 key words!

✅ -ABLE — Root IS a Complete Word

comfortablecomfortible ✗⭐⭐

KUMF-tuh-bul

At ease

💡 COMFORT is a word → comfortABLE

“A comfortable sofa.”

fashionablefashionible ✗⭐⭐

FASH-un-uh-bul

Trendy

💡 FASHION is a word → fashionABLE

“A fashionable outfit.”

reasonablereasonible ✗⭐⭐

REE-zun-uh-bul

Fair, logical

💡 REASON is a word → reasonABLE

“A reasonable price.”

enjoyableenjoyible ✗⭐⭐

en-JOY-uh-bul

Pleasant

💡 ENJOY is a word → enjoyABLE

“An enjoyable trip.”

dependabledependible ✗⭐⭐

dih-PEN-duh-bul

Reliable

💡 DEPEND is a word → dependABLE

“A dependable friend.”

washablewashible ✗⭐

WOSH-uh-bul

Can be washed

💡 WASH is a word → washABLE

“Machine washable fabric.”

breakablebreakible ✗⭐

BRAY-kuh-bul

Can be broken

💡 BREAK is a word → breakABLE

“Handle breakable items carefully.”

laughablelaughible ✗⭐⭐

LAF-uh-bul

Ridiculous

💡 LAUGH is a word → laughABLE

“A laughable excuse.”

avoidableavoidible ✗⭐⭐

uh-VOY-duh-bul

Can be avoided

💡 AVOID is a word → avoidABLE

“An avoidable mistake.”

affordableaffordible ✗⭐⭐

uh-FOR-duh-bul

Not expensive

💡 AFFORD is a word → affordABLE

“Affordable housing.”

🔄 -IBLE — Root is NOT a Complete Word

visiblevisable ✗⭐⭐

VIZ-ih-bul

Can be seen

💡 VIS is NOT a word → visIBLE

“Barely visible in fog.”

possiblepossable ✗⭐⭐

POS-ih-bul

Can happen

💡 POSS is NOT a word → possIBLE

“Anything is possible!”

terribleterrable ✗⭐⭐

TER-ih-bul

Very bad

💡 TERR is NOT a word → terrIBLE

“A terrible storm.”

horriblehorrable ✗⭐⭐

HOR-ih-bul

Dreadful

💡 HORR is NOT a word → horrIBLE

“A horrible nightmare.”

incredibleincredable ✗⭐⭐

in-KRED-ih-bul

Unbelievable

💡 INCRED is NOT a word → incredIBLE

“An incredible performance!”

responsibleresponsable ✗⭐⭐

rih-SPON-sih-bul

Having duty

💡 RESPONS is NOT a word → responsIBLE

“Be responsible citizens.”

sensiblesensable ✗⭐⭐

SEN-sih-bul

Practical, wise

💡 SENS is NOT a word → sensIBLE

“A sensible decision.”

flexibleflexable ✗⭐⭐

FLEK-sih-bul

Can bend

💡 FLEX is NOT a word → flexIBLE

“Be flexible with plans.”

accessibleaccessable ✗⭐⭐

ak-SES-ih-bul

Easy to reach

💡 ACCESS + IBLE

“Wheelchair accessible.”

edibleedable ✗⭐⭐

ED-ih-bul

Safe to eat

💡 ED is NOT a word → edIBLE

“Is this mushroom edible?”

🔊 Keep E Before -ABLE (CE/GE Words)

noticeablenoticable ✗⭐⭐

NOH-tis-uh-bul

Can be noticed

💡 KEEP E! Keeps C soft → noticeABLE

“A noticeable change.”

manageablemanagable ✗⭐⭐

MAN-ij-uh-bul

Can be handled

💡 KEEP E! Keeps G soft → manageABLE

“A manageable workload.”

changeablechangable ✗⭐⭐

CHAYNJ-uh-bul

Likely to change

💡 KEEP E! Keeps G soft → changeABLE

“Changeable weather.”

traceabletracable ✗⭐⭐

TRAY-suh-bul

Can be traced

💡 KEEP E! Keeps C soft → traceABLE

“Easily traceable.”

replaceablereplacable ✗⭐⭐

rih-PLAY-suh-bul

Can be replaced

💡 KEEP E! → replaceABLE

“Nobody is replaceable.”

knowledgeableknowledgable ✗⭐⭐

NOL-ij-uh-bul

Well-informed

💡 KEEP E! → knowledgeABLE

“A knowledgeable teacher.”

serviceableservicable ✗⭐⭐

SUR-vis-uh-bul

Usable, functional

💡 KEEP E! → serviceABLE

“Still serviceable equipment.”

enforceableenforcable ✗⭐⭐

en-FOR-suh-bul

Can be enforced

💡 KEEP E! → enforceABLE

“A legally enforceable rule.”

peaceablepeacable ✗⭐⭐

PEE-suh-bul

Peaceful in nature

💡 KEEP E! → peaceABLE

“A peaceable solution.”

bridgeablebridgable ✗⭐⭐

BRIJ-uh-bul

Can be bridged

💡 KEEP E! → bridgeABLE

“A bridgeable gap.”

⚠️ Tricky -ABLE Words (Exceptions!)

capablecapible ✗⭐⭐

KAY-puh-bul

Having ability

💡 CAP is a word but it’s capABLE (not capible!)

“A capable student.”

valuablevaluible ✗⭐⭐

VAL-yoo-uh-bul

Worth a lot

💡 VALUE → drop E + ABLE

“Valuable advice.”

adorableadorible ✗⭐⭐

uh-DOR-uh-bul

Very cute

💡 ADORE → drop E + ABLE

“An adorable puppy!”

debatabledebatible ✗⭐⭐

dih-BAY-tuh-bul

Open to argument

💡 DEBATE → drop E + ABLE

“A debatable topic.”

tolerabletolerible ✗⭐⭐

TOL-uh-ruh-bul

Bearable

💡 TOLER + ABLE

“The heat is barely tolerable.”

vulnerablevulnerible ✗⭐⭐

VUL-nuh-ruh-bul

Open to harm

💡 VULNER + ABLE

“Children are vulnerable.”

inevitableinevitible ✗⭐⭐

in-EV-ih-tuh-bul

Cannot be avoided

💡 INEVIT + ABLE

“Change is inevitable.”

formidableformidible ✗⭐⭐

FOR-mih-duh-bul

Impressive/frightening

💡 FORMID + ABLE

“A formidable opponent.”

admirableadmirible ✗⭐⭐

AD-muh-ruh-bul

Worthy of respect

💡 ADMIR + ABLE

“An admirable quality.”

memorablememorible ✗⭐⭐

MEM-uh-ruh-bul

Worth remembering

💡 MEMOR + ABLE

“A memorable day.”

🎯 Tricky -IBLE Words

invisibleinvisable ✗⭐⭐

in-VIZ-ih-bul

Cannot be seen

💡 in + VISIBLE → invisIBLE

“Invisible ink.”

compatiblecompatable ✗⭐⭐

kum-PAT-ih-bul

Working well together

💡 COMPAT + IBLE

“Compatible devices.”

convertibleconvertable ✗⭐⭐

kun-VUR-tih-bul

Can be converted

💡 CONVERT + IBLE

“A convertible car.”

digestibledigestable ✗⭐⭐

dy-JES-tih-bul

Can be digested

💡 DIGEST + IBLE

“Easily digestible food.”

reversiblereversable ✗⭐⭐

rih-VUR-sih-bul

Can be reversed

💡 REVERS + IBLE

“A reversible jacket.”

contemptiblecontemptable ✗⭐⭐⭐

kun-TEMP-tih-bul

Deserving contempt

💡 CONTEMPT + IBLE

“A contemptible act.”

irresistibleirresistable ✗⭐⭐

ir-ih-ZIS-tih-bul

Cannot resist

💡 IRRESIST + IBLE

“Irresistible chocolate!”

destructibledestructable ✗⭐⭐

dih-STRUK-tih-bul

Can be destroyed

💡 DESTRUCT + IBLE

“Not easily destructible.”

permissiblepermissable ✗⭐⭐

pur-MIS-ih-bul

Allowed

💡 PERMISS + IBLE

“Is this permissible?”

collapsiblecollapsable ✗⭐⭐

kuh-LAP-sih-bul

Can be folded up

💡 COLLAPS + IBLE

“A collapsible umbrella.”

📐 5 Spelling Rules

Root = Complete Word → Usually -ABLE

If removing -able leaves a real word: comfortable (comfort), enjoyable (enjoy), washable (wash).

✅ comfortable, enjoyable, washable, breakable, affordable

Root = NOT Complete Word → Usually -IBLE

If removing -ible doesn’t leave a real word: visible (vis?), possible (poss?), terrible (terr?).

✅ visible, possible, terrible, horrible, edible, sensible

After CE/GE → Keep E + ABLE

noticeable, manageable, changeable — E stays to keep C/G soft before -able.

✅ noticeable, manageable, changeable, knowledgeable

After Soft G/C Without E → Often -IBLE

Words with soft G/C sounds often use -ible: eligible, legible, negligible.

✅ eligible, legible, negligible, tangible, invincible

When In Doubt → Check the -TION/-SION Form

If the noun form uses -ATION → -ABLE (admiration→admirable). If -SION/-TION → -IBLE (permission→permissible).

✅ -ATION→-ABLE: admirable | -SION→-IBLE: permissible

🐝 Spelling Quiz

1. comfort + ? = comfortable

2. vis + ? = visible

3. notice + ? = noticeable

4. respons + ? = responsible

5. enjoy + ? = enjoyable

6. poss + ? = possible

7. manage + ? = manageable

8. terr + ? = terrible

9. afford + ? = affordable

10. The main pattern is:

🔀 Word Scramble

Unscramble the letters

BLORFMOATEC

BLSIENOPS

BLIVEIS

BLAECEINOT

BLRDAOAEF

✏️ Fill in Missing Letters

Type the missing letters

comfort_ble

respons_ble

vis_ble

notic_able

terr_ble

❓ FAQ

Is there a rule for -able vs -ible?

The best pattern: if removing the suffix leaves a complete word (comfort, enjoy, wash), use -ABLE. If not (vis, poss, terr), use -IBLE. This works about 80% of the time.

Why keep E in ‘noticeable’?

After CE or GE, the E keeps the consonant soft. Without E, C would sound like K (notik-able) and G would sound hard (manag-able). The E preserves the soft sound.

Are there more -ABLE or -IBLE words?

There are about 900 -ABLE words and only about 200 -IBLE words in English. So when in doubt, -ABLE is statistically more likely to be correct!

What about ‘capable’ — cap IS a word!

Good catch! ‘Capable’ is an exception — ‘cap’ is a word but it uses -ABLE anyway. The pattern isn’t perfect, which is why some words just need to be memorized.

Does the -TION/-SION trick really work?

Usually! If the noun form uses -ATION: admiration→admirable. If it uses -SION or -ION: permission→permissible, destruction→destructible. It’s a useful backup check.

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