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Suspiciously is an adverb.
John viewed the picture suspiciously for signs of tampering.
Suspiciously is an adverb, yes.Some example sentences are:He suspiciously stuffed the bags into a nearby hedge.The man was taken aside by police for behaving suspiciously.
The adverb for suspicious is suspiciously.
Yes, suspiciously is an adverb. It means in a manner causing suspicion.