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English definition of “suspicious”

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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.)
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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).
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(Definition of suspicious from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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