The meaning of SUSPICIOUS is tending to arouse suspicion : questionable. How to use suspicious in a sentence.

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/ …

1. tending to cause or excite suspicion; questionable: suspicious behavior. 2. inclined to suspect, esp. inclined to suspect evil; distrustful. 3. full of or feeling suspicion. 4. expressing or indicating suspicion: …

Definition of suspicious adjective from the Oxford Advanced Learner's Dictionary. suspicious (of/about somebody/something) feeling that somebody has done something wrong, illegal or dishonest, …

If you are suspicious of someone or something, you do not trust them, and are careful when dealing with them.

sus•pi•cious (sə spish′ əs), adj. tending to cause or excite suspicion; questionable: suspicious behavior. inclined to suspect, esp. inclined to suspect evil; distrustful: a suspicious tyrant. full of or feeling …

Oct 26, 2025 · From Old French sospecious, from Latin suspiciosus, suspitiosus. suspicious (comparative more suspicious, superlative most suspicious) His suspicious behaviour brought him to …

To be suspicious is to have a suspicion about someone or something, especially to have a feeling of distrust about the person or thing.

She became suspicious of his behavior. The dog is suspicious of strangers. [=the dog does not trust strangers] We noticed the suspicious stare of the security guard.

Definitions of suspicious adjective openly distrustful and unwilling to confide synonyms: leery, mistrustful, untrusting, wary