/ səˈspɪʃəs; NAmE / adjective
1.
suspicious (of / about sb/sth) feeling that sb has done sth 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.
making you feel that sth 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 was all very suspicious.
3.
suspicious (of sb/sth) not willing or able to trust sb/sth
SYN sceptical :
I was suspicious of his motives.
Many were suspicious of reform.
—see also suspect
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WORD ORIGIN
Middle English : from Old French suspicious , from Latin suspiciosus , from suspicio(n-) suspicion.