thinking that someone might be guilty of doing something wrong or dishonest
Some of his colleagues at work became suspicious of his behaviour.
They were suspicious about my past.
His reluctance to answer my questions made me suspicious.
She gave him a suspicious glance.
You've got a very suspicious mind!
making you think that something bad or illegal is happening:
They found a suspicious package under the seat.
a suspicious death
He was behaving in a highly suspicious manner.
a suspicious-looking character
Call the police if you see anything suspicious.
Her mother had died in suspicious circumstances.
feeling that you do not trust someone or something [= wary]
She was always suspicious of strangers.
He was deeply suspicious of the legal system.