1. un-
able- unable
comfortable-uncomfortable
fair- unfair
friendly- unfriendly
grateful- ungrateful(不领情的)
happy- unhappy
healthy- unhealthy
helpful- unhelpful(无帮助的)
important- unimportant
kind- unkind
known- unknown
lucky- unlucky
necessary- unnecessary
pleasant- unpleasant
popular- unpopular
tidy- untidy
usual- unusual
welcome- unwelcome
2. –less
careful-careless
helpful-helpless(无助的，需要帮助的)
useful- useless
harmful- harmless
hopeful-hopeless
meaningful- meaningless
end- endless
3. dis-
honest- dishonest
agree- disagree
耐心的反义词是什么like- dislike
appear- disappear
advantage- disadvantage
4. in-
correct- incorrect
active- inactive
5.im-
possible- impossible
polite- impolite
patient- impatient
6.ir-
regular- irregular
一类：加前缀-un
例词：unhappy unusual ungrateful unhelpful unkind
第二类：加后缀-less
例词：careless homeless hopeless
第三类：加前缀-im
例词：impolite(不礼貌的) impatient（不耐心的） impossible（不可能的）
第四类：加前缀-in
例词：incorrect（不正确的） inactive（不活跃的）
第五类：加前缀-dis
例词：dishonest（不诚实的）
第六类：加前缀-ir
例词：irregular（不规则的）
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