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suspicious
01
not conforming to the expected or usual pattern, giving rise to doubt or concern
02
doubtful about the honesty of what someone has done and having no trust in them
Example
Her unusually quiet demeanor at the party was suspicious to her close friends.
The dog kept barking at a suspicious shadow by the garden fence.
They reported the suspicious email to IT, fearing it might be a phishing attempt.
The suspicious behavior warranted the attention of law enforcement.
The vigilant guard held a flashlight on the suspicious figure.