Definition of suspicious adjective from the Oxford Advanced Learner's Dictionary

      

    suspicious

     adjective
    adjective
    BrE BrE//səˈspɪʃəs//
     
    ; NAmE NAmE//səˈspɪʃəs//
     
     
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  1. 1  suspicious (of/about somebody/something) feeling that somebody has done something wrong, illegal or dishonest, without having any proof They became suspicious of his behaviour and contacted the police. a suspicious look You have a very suspicious mind (= you always think that people are behaving in an illegal or dishonest way).
  2. 2  making you feel that something is wrong, illegal or dishonest Didn't you notice anything suspicious in his behaviour? She died in suspicious circumstances. Police are not treating the fire as suspicious. It might look suspicious if we arrived together. It was all very suspicious.
  3. 3  suspicious (of somebody/something) not willing or able to trust somebody/something synonym sceptical I was suspicious of his motives. Many were suspicious of reform. see also suspect
  4. Word Familysuspect verbsuspected adjectivesuspicion nounsuspicious adjectivesuspiciously adverbsuspect noun adjective Word Origin Middle English: from Old French suspicious, from Latin suspiciosus, from suspicio(n-) ‘suspicion’.Extra examples British voters are rightly suspicious of attempts to save money in the area of education. He was seen acting in a highly suspicious manner. His voice grew faintly suspicious. I find it very suspicious that he left halfway through the morning. I have a naturally suspicious mind. I think they’re starting to get suspicious. Inform the police immediately if you see anything suspicious. Parents have every right to be suspicious of what the experts tell them. Police are treating both fires as suspicious. She remained deeply suspicious of computers. She was highly suspicious of his motives. Something about her smile made him suspicious. They were somewhat suspicious about her past. We have to carry on as usual or it would look suspicious. Didn’t you notice anything suspicious in his behaviour? Police are not treating the death as suspicious. She cast a suspicious glance at him. She died in suspicious circumstances. You have a very suspicious mind.
See the Oxford Advanced American Dictionary entry: suspicious