(1) 怀疑的，不肯定的((of a person) feeling or full of doubt; unsure) [A(of/about)，A+wh/wh+to-inf] [通常作pred]：be (feel/seem)～of (about) sb/success 对(感觉对/似乎对)某人/成功心存怀疑;be (feel/seem)～of (about) the value of sb's suggestion/the weather for tomorrow/the wisdom of one's choice/sb's good intention/sb's ac-cepting the job 对(感觉对/似乎对)某人建议的价值/明天的天气/自己的选择是否明智/某人的好意/某人是否接受那个工作有怀疑;be (feel/seem)～(about) whether to go or not/where to go/whether the chairman would approve对(感觉对/似乎对)是否该去/该去哪里/主席是否会批准疑惑不定;〖同〗uncertain，unsure，undecided，unconvinced;〖反〗certain，sure，decided;

(2) 令人产生疑问的，不明的(causing doubt; able to be doubted)：The future/weather/outcome of the game/result of the experiment looks (is) rather (very)～. 未来/天气/比赛的结局/实验的结果看来(是)很值得怀疑。a～ally 不可靠的同盟者;a～result/story/excuse/success/advantage 令人生疑的结果/故事/借口/成功/优势;It's a～blessing. 这是不是福还不知道。a man of～habits 一个有莫名其妙习惯的人;a book of～merit 一本很难确定价值的书;〖同〗unclear， vague， uncertain;

(3) 可疑的，可能不诚实的，有问题的(causing suspicion; looking dishonest; questionable) [作attrib]：a～neighbourhood 可疑的邻居;a man with a～past 一个经历可疑的人;He seems a～fellow to us.他令我们觉得可疑。There's a～person/character looking in the windows of your house. 有个可疑的人正往你家窗户里看。I think the manuscript is of～authenticity. 我认为这手稿的真实性有问题。〖同〗suspicious， suspect， questionable;

(4) 不一定的，未必的，不大可能的(unlikely; improbable)：It is～whether (if) this will work/he'll be able to come. 这会不会奏效/他能不能来还不一定。 It is extremely～that anyone survived the air crash.这次飞机失事中有人幸存是极不可能的。The wisdom of this action is～. 这一行动未必明智。〖同〗unlikely， improbable;

←doubt n;

→′doubtfully adv 可疑地;′doubtfulness n 可疑性