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(1)不肯定(確知)的(not definitely knowing;not confident or sure)[無comp][通常作pred][A(of/about)]：be～of/about sb's intentions/sb's wishes/sb's legal rights/the truth對某人的意圖/愿望/法律權(quán)利/事實心中無數(shù);The actor is still～of his words/his ability (to play the part). 這位演員對他的臺詞/(扮演此角色的)能力還心中無數(shù)。I shall certainly be present， but I'm～about my wife. 我肯定要出席，但是至于我的妻子是否出席我說不好。be/feel～(about) what to do不能肯定要做什么/覺得說不好該做什么;The government is～what is the best thing to do. 政府還不能肯定什么是最應(yīng)該做的事情。Whether the game will be held or not is～. 還不能肯定比賽是否舉行?！纪絬nsure，doubtful，indefinite，unconfirmed;〖反〗certain，definite，sure，assured，confirmed，positive;

(2)難以預(yù)料的，未知(定)的(not known or established;vague)：The plan for holiday is～.假日計劃還未確定。a manuscript of～origin來歷不明的手稿;An～number of people were waiting. 一些人正在等侯，人數(shù)不詳。An～shape loomed ahead in the darkness. 黑暗中赫然出現(xiàn)一個模糊的身影。The outcome of the election is still～. 選舉結(jié)果仍難以預(yù)料。a lady of～age一位無法猜出其年齡的女士;She gave him an ultimatum in no～terms.她斷然向他發(fā)出最后通諜。〖同〗unpredictable，undetermined，indefinite，indistinct;〖反〗certain，definite，predictable，known，determined;

(3)易變(無常)的，捉摸不定的(subject to change;variable)：a man of～temper喜怒無常的人;The aim is～.目標搖擺不定。 The dog is of～temper. 這條狗脾性多變。U～weather delayed (postphoned) our departure/our beach trip. 變幻莫測的天氣拖延(推遲)了我們的離去/海灘旅行。U～people make poor leader. 變化無常的人當(dāng)不了好領(lǐng)導(dǎo)。〖同〗variable，unsure;〖反〗 certain，definite，firm，resolute，unvarying;

(4)不穩(wěn)定的，遲疑的(unsteady;fitful)：an～voice/smile含糊的嗓音/勉強一笑;the baby's first～steps 嬰兒蹣跚學(xué)步;

←′certain adj;

→un′certainly adv猶豫地;un′certainness n變化無常;un′certainty n易變化