(manner) In a way suggesting suspicion.
The police officer looked at her suspiciously.
(manner) In a way that arouses suspicion.
She was behaving very suspiciously.
(evaluative) Causing suspicion.
Suspiciously, he had taken out an insurance policy on his wife just months earlier.
(degree) To a degree that makes one suspect something.
It looked suspiciously like a molding-compound repair of a dent.