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Negative prefixes: im-, in-, un-
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patient
impatient
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happy
unhappy
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frequent
infrequent
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real
unreal
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friendly
unfriendly
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prepared
unprepared
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correct
incorrect
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usual
unusual
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secure
insecure
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Okay!
able
unable
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Polite
impolite
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Okay!
comfortable
uncomfortable
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perfect
imperfect
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expensive
inexpensive
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sure
unsure
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Believable
unbelievable
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mobile
immobile
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possible
impossible
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Okay!
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