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English definition of “suspicious”

suspicious

adjective uk   /səˈspɪʃ.əs/ us  

suspicious adjective (SEEM GUILTY)

B2 making you feel that something illegal is happening or that something is wrong: Her behaviour was very suspicious. The fire at the bank is being treated as suspicious. It's a bit suspicious that no one knows where he was at the time of the murder. There were some suspicious characters hanging around outside. There's a suspicious-looking van parked at the end of the road. His new book bears a suspicious resemblance to a book written by someone else. (= His book is so similar to the other book that it seems as if he has copied it.)

suspicious adjective (DOUBT)

B2 feeling doubt or no trust in someone or something: His colleagues became suspicious (= thought that there was something wrong) when he did not appear at work, since he was always punctual. They are deeply/highly (= very) suspicious of one another/of each other's motives. My mother has a very suspicious nature (= does not trust people).
(Definition of suspicious from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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