漢： 前綴un-來源于盎格魯-撒克遜語，在形容度詞或副詞前，意為“not”；在名詞前，意為“lack of reverse of”。此外，用做“cause to be no longer degrade from the position of”等意思時，主要把名詞轉(zhuǎn)為動詞，或表示與原動詞意思相對或相反的行為。 英： un- (1) prefix of negation, Old English un-, from P.Gmc. *un- (cf. Old Frisian, Old High German, German un-, Gothic un-, Dutch on-), from PIE *n- (cf. Sanskrit a-, an- "not," Greek a-, an-, Old Irish an-, Latin in-), a variant of PIE root *ne- "not" (cf. Avestan na, Old Church Slavonic and Lithuanian ne "not," Latin ne "that not," Greek ne- "not," Old Irish ni, Cornish ny "not"). Freely and widely used since Old English in compounds with native and imported words, it disputes with Latin-derived cognate in- the right to form the negation of certain words (indigestable/undigestable, etc.). Often euphemistic (e.g. untruth for "lie"). The most prolific of English prefixes, it even is used to make words from phrases (e.g. uncalled-for, c.1600; undreamed-of, 1630s; uncome-at-able, 1690s; unputdownable, 1947, of a book; un-in-one-breath-utterable, Ben Jonson; etc.). As a prefix in telegram-ese to replace not and save the cost of a word, it is first attested 1936. un- (2) prefix of reversal (e.g. unhand, undo, unbutton), O.E. on-, un-, from P.Gmc. *andi- (cf. O.S. ant-, O.N. and-, Du. ont-, O.H.G. ant-, Ger. ant-, Goth. and- "against"), from PIE *anti "facing opposite, near, in front of, before" (see ante). 共詳細分為以下六類意思： 1.un-表示“不” unabashed a.not abashed,embarrassed or awed 不害怕的，不難為情，泰然的 Tim appeared unabashed by all the media attention 蒂姆成了媒體的焦點，卻也滿不在乎。 unalterable a.not alterable 無法變更的 alter=other The state of New York has designed its new drivers'licenses to be virtually. 紐約新設(shè)計的駕駛執(zhí)照實際上是不可變更的。 2.un-表示“無” uncouth a.tough,awkward,not cultured (人，行為)粗魯?shù)?，粗俗的；笨拙的；無教養(yǎng)的 A man considered uncouth or mean; a boor. 被認為粗魯?shù)幕虮氨傻娜? 舉止粗魯?shù)娜?/p> 3.un-表示“非” unearthly a.very strange;superntural and therefore frightening 非自然的；異常的；怪異的； An unearthly glow emanated from the house. 那個房子里發(fā)出一束奇異的光。 4.un-表示“未” unmitigated a.not mitigated;complete;absolute 未減輕的；完全的；絕對的 詞根mitig=soft The UN can no longer turn a blind eye to the unmitigated suffering of the Bosnians. 聯(lián)合國再也不能對波斯尼亞人未曾減輕的痛苦坐視不管了。 5.un-表示“相反動作、取消、除去” unlock vt. 開啟，顯露，放開 I unlocked the door and went into the room. 我打開房門，然后走進屋里。 6.un-表示“由...中弄出” untomb v. 由墳墓中掘出，揭露 unearth vt. 發(fā)掘，掘出，發(fā)現(xiàn)并披露 I unearthed the portrait from the attic. 我從閣樓上搜出這幅畫像。