American English

Definition of suspicious adjective from the Oxford Advanced American Dictionary

      

    suspicious

     adjective
    adjective
    NAmE//səˈspɪʃəs//
     
     
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  1. 1suspicious (of/about somebody/something) feeling that someone has done something wrong, illegal, or dishonest, without having any proof They became suspicious of his behavior 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 behavior? She died under suspicious circumstances. Police are not treating the fire as suspicious. It might look suspicious if we arrived together. It was all very suspicious.
  3. 3suspicious (of somebody/something) not willing or able to trust someone or something synonym skeptical I was suspicious of his motives. Many were suspicious of reform. see also suspect
  4. Word Familysuspect verbsuspected adjectivesuspicion nounsuspicious adjectivesuspiciously adverbsuspect noun adjective
See the Oxford Advanced Learner's Dictionary entry: suspicious