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