Meanings
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1
adv
In a way that makes people think something is wrong or dishonest.
She was behaving very suspiciously.
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2
adv
In a way that shows you do not trust someone or something.
The police officer looked at her suspiciously.
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3
adv
To a degree that makes you suspect something.
The deal seemed suspiciously cheap.
Etymology
From suspicious + -ly.