英语单词否定前缀有：dis -dislike、im -impossible、in -inexpensive、ir -irregular、an -anhydrous（无水的）、un- unable、、anti -anti-black、de-,decolor 等等
表示否定意义的前缀
1)纯否定前缀
a-, an-, asymmetry（不对称）anhydrous（无水的）
dis- dishonest, dislike
in-, ig-, il, im, ir, incapable, inability, ignoble, impossible, immoral, illegal, irregular
ne-, n-, none, neither, never
non-, noesense
neg-, neglect
un- unable, unemployment
2)表示错误的意义
male-, mal-, malfunction, maladjustment(失调)
mis-, mistake, mislead
pseudo-, pseudonym(假名), pseudoscience
3)表示反动作的意思
de-, defend, demodulation(解调)
dis-, disarm, disconnect
un-, unload, uncover
4)表示相反，相互对立意思
anti-, ant- antiknock( 防震), antforeign,(排外的)
contra-, contre-, contro-, contradiction, countercurrent (逆流)
counter-, counterreaction, counterbalance
ob-, oc-, of-, op-, object, oppose, occupy
with-, withdraw, withstand
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