. 形容词的否定(反义词) ★加前缀 一．在单词前加‘un’ 1.comfortable → uncomfortable 2.happy → unhappy 3.necessary → unnecessary 4.important → unimportant 5.friendly → unfriendly 7.able → unable 9.successful → unsuccessful 11.healthy → unhealthy 13.suitable → unsuitable 15.kind → unkind 17.safe → unsafe (dangerous) 19.usual → unusual 21.pleasant → unpleasant 23.lucky → unlucky 25.tidy → untidy 二．在单词前加‘dis’ honest → dishonest 三．在p,b,m开头的形容词前加‘ 1.possible → impossible 3.patient → impatient 四．在单词前加‘in’ ；. 6.welcome → unwelcome 8.common → uncommon 10.excited → unexcited 12.popular → unpopular 14.grateful → ungrateful 16.likely → unlikely 18.helpful → unhelpful 20.willing → unwilling 22.real → unreal 24.luckily → unluckily im’ 2.polite → impolite (rude) . 1. correct → incorrect 2.correctly → incorrectly 3. expensive → inexpensive (cheap) 五．在r开头的形容词前加‘ir’ regular → irregular ★改后缀 1.careful → careless 3.useful → useless ★不一样的单词 1.boring → interesting 3.closed → open 5.cold → hot 7.easy → difficult 9.fast / quickly → slowly 11.hungry → full 13.long → short 15.young → old 17.dangerous → safe 19.empty → full 21.soft → hard 23.true → false 25.male → female ；. 2.carefully → carelessly 2.cheap → expensive 4.close → far 6.dark → bright / light 8.fast / quick → slow 10.heavy → light 12.large → small 14.strong → weak 16.right/correct → wrong 18.dirty → clean 20.noisy → quiet 22.generous → mean 24.thin/slim → fat 本文来源：https://www.wddqw.com/doc/b8c1f2d9ea7101f69e3143323968011ca200f733.html