Meaning of “suspicious” - Learner’s Dictionary

suspicious

adjective uk us /səˈspɪʃəs/
WRONG/BAD

B2 making you feel that something is wrong or that something bad or illegal is happening:

I called airport security after noticing a suspicious package.
NOT TRUST

B2 not trusting someone:

Many of them remain suspicious of journalists.
suspiciously adverb

B2

She's been acting very suspiciously lately.

(Definition of “suspicious” from the Cambridge Learner’s Dictionary © Cambridge University Press)