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usual
unusual
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fair
unfair
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responsible
irresponsible
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perfect
imperfect
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visible
invisible
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regular
irregular
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like
dislike
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known
unknown
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agree
disagree
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direct
indirect
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patient
impatient
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possible
impossible
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common
uncommon
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advantage
disadvantage
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paid
unpaid
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able
unable
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clear
unclear
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necessary
unnecessary
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correct
incorrect
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mature
immature
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expensive
inexpensive
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safe
unsafe
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honest
dishonest
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connect
disconnect
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friendly
unfriendly
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happy
unhappy
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approve
disapprove
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limited
unlimited
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