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885 un-
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un-是最常用的前缀之一。
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（1）可以用在某些形容词（或副词）前，构成反义词，表示“不”，如：
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unacceptable unaccountable unaccountably unadvisable unapproachable unavailable unaware(s) unavoidable unbelievable unbelievably unceremonious uncomfortable uncommon uncompromising unconditional unconquerable unconscious(ly) undesirable undoubtedly undue uneconomic unemotional unendurable unequal unessential uneven uneventful unfair unfavourable unfit unforgettable unforgivable unfortunate(ly) ungrammatical ungrateful unhappily unimaginable unimportant unjust unlawful unlike unlikely unlucky unnatural unnecessary unobtainable unofficial unpardonable unpleasant unprejudiced unprofitable unquestionable unquestionably unreadable unreal unrecognizable unreliable unsatisfactory unscientific unscrupulous unselfish unskilful unspeakable unsuccessful unsystematic unthinkable untrue untrustworthy unusual unwavering unwelcome unwell unwilling(ly) unwise （2）或加在动词前，表示“解开”、“打开”、“拿开”等：
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unbosom unburden unbutton uncoil uncover undo undress unearth unfasten unfold unhang unknit unlace unleash unload unlock unmask unmoved unpack unpin unquote unscrew unstring untie unwrap （3）还可加在过去分词前，表示“不……”、“没有……”等，如：
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unabridged unaccompanied unaccustomed unaffected unaided unarmed unbalanced unconcerned uncultivated uncultured undreamt-of uneducated unemployed unexpected unfinished unforeseen unfounded unfulfilled unfurnished ungrounded unheard-of unidentified uninvited uninhabited unknown unmarried unprecedented unqualified unreserved unroll unread unrestrained unsatisfied unskilled unseen unstressed untruth （4）还可和个别名词构成反义词：
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uncertainty uneasiness unemployment unhappiness unpleasantness unrest unwillingness 886 under-
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under-也是一个常用前缀。
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（1）和名词构成合成词，表示“下面的”、“里面的”：
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underbelly 下腹部
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undercurrent 潜流
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underclothes 内衣
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undergarment 内衣
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underground 地下的
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underpants 内裤
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undersea 海底（下）的
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underside 下侧（面）
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underwater 水下的
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underworld 下层社会，黑社会
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还可表示“下一级的”：
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undergraduate 本科生（比研究生低的）
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undersecretary 副部长
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（2）和动词构成合成词表示“……不足（太低）”，如：
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underbid 出价偏低
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