suspicious
adj.adj. feeling that someone has done something wrong or that a situation is not honest. You can also use it to describe something that looks strange or dangerous.
adj. having or showing a cautious distrust of someone or something; causing a feeling that something is wrong or illegal.
The police are looking for a suspicious man in the area.
She became suspicious when the stranger asked for her bank details over the phone.
The sudden disappearance of the documents under such suspicious circumstances prompted an immediate internal investigation by the board of directors.
From Old French sospecious, from Latin suspiciosus, suspitiosus.
Often takes the preposition 'of' when referring to the object of distrust.
I am suspicious about himI am suspicious of himWhile 'about' is sometimes heard in casual speech, 'of' is the standard preposition used with this adjective to indicate the person or thing being doubted.