I
ill(病的)- healthy, well(健康的)
in(在……里)- out(向外)
inside(在里面)- outside(在外面)
interesting(有趣的)- boring(无聊的),dull(无趣的)
J
join(连接)- separate(使分开)
junior(地位或职位低的)- senior(级别或地位高的)
K
knowledge(知识)- ignorance(无知)
known(知名的)- unknown(不出名的)
L
large(大的)- small(小的)
last(最后)- first(第一)
laugh(笑)- cry(哭)
lawful(合法的)- unlawful, illegal(非法的)
leader(领导者)- follower(追随者)
left (左)- right(右)
lend(借出)- borrow(借入)
less(更少的)- more(更多的)
light(轻的)- heavy(重的)
like(喜欢)- dislike(不喜欢),hate(讨厌)
likely(可能的)- unlikely(不大可能的)
little(小的)- big(大的)
long(长的)- short(短的)
loose(松的)- tight(紧的)
lose(丢失)- find(找到)
lose(输掉)- win(获胜)
loud(大声的)- quiet(安静的)
love(爱)- hate(恨)
low(低的)- high(高的)