Prefixes

These prefixes give words an opposite meaning:

de – often used with verbs

Activate – deactivate

Appreciate – depreciate

Promote – demote

dis – used with adjectives, nouns, verbs

Arm – disarm

Appear – disappear

Organised – disorganised

Order (noun) – disorder

il – used with adjectives starting with l

Legal – illeagal

Legitimate – illegitimate

im – used with adjectives starting with p, m

Possible – impossible

Partial – impartial

Mortal – immortal

in – used with adjectives, often starting with e, c

Effective – ineffective

Edible – inedible

Competent – incompetent

Complete – incomplete

ir – used with adjectives, often starting with r

Regular – irregular

Replaceable – irreplaceable

un – used with adjectives and verbs

Dress – undress (verb)

Tidy – untidy

Expected – unexpected

Wise – unwise

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