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Prefixes: What's The Opposite?

able

un

unable

responsible

ir

irresponsible

do

un

undo

relevant

ir

irrelevant

direct

in

indirect

comfortable

un

uncomfortable

legal

il

illegal

expected

un

unexpected

patient

im

impatient

equal

un

unequal

literate

il

illiterate

complete

in

incomplete

polite

im

impolite

active

in

inactive

identified

un

unidentified

reliable

un

unreliable

reasonable

un

unreasonable

stable

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unstable

secure

in

insecure

accurate

in

inaccurate

fair

un

unfair

aware

un

unaware

valid

in

invalid

effective

in

ineffective

logical

il

illogical

flexible

in

inflexible

cover

un

uncover

professional

un

unprofessional

accessible

in

inaccessible

common

un

uncommon

pure

im

impure

veil

un

unveil

friendly

un

unfriendly

conspicuous

in

inconspicuous

willing

un

unwilling

replaceable

ir

irreplaceable

rational

ir

irrational

sufficient

in

insufficient

precise

im

imprecise

efficient

in

inefficient

mature

im

immature

capable

in

incapable

appropriate

in

inappropriate

legitimate

il

illegitimate

significant

in

insignificant

perfect

im

imperfect

regular

ir

irregular

fortunate

un

unfortunate

grateful

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ungrateful

consistent

in

inconsistent

known

un

unknown

employed

un

unemployed

adequate

in

inadequate

possible

im

impossible

believable

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unbelievable

clear

un

unclear

important

un

unimportant

justifiable

un

unjustifiable

reversible

ir

irreversible

achievable

un

unachievable

usual

un

unusual

certain

un

uncertain

cooperative

un

uncooperative