You know the meaning of the word "suspicious," right? Well, when you add the "ly" suffix, you turn the word into an adverb, so it means "in a suspicious way."
For example . . .
She glanced at him suspiciously. "Where did you go?" she asked suspiciously, her face taut.
See what I mean? :)
Suspiciously is an adverb. John viewed the picture suspiciously for signs of tampering.
"Have you done much to civilize him?" Laura eyed Joseph suspiciously.
I called the police after seeing two men walking around my neighbors house suspiciously.
the old woman was acting suspiciously
There he mingled with the revellers, and walked slowly onward, seeking suspiciously and anxiously for his vanished favorite.Silas Peckham slanted his eye up suspiciously at the Doctor, as if he was getting some kind of advantage over him.Charles gazed suspiciously around the small, neat room.
.."Although I Didn't Want To Admit It, In Certain Lights, My Face Looks Suspiciously Hairy For A 20 Year Old Woman.."
Somewhere in my head, a voice that sounded suspiciously like Dimitri's started talking about wise choices and learning when to show restraint. *Frostbite - Richelle Mead*
The pecuniary arrangements between the two businesses looked suspiciously like money laundering. His father's watch had some pecuniary value, but that wasn't why he kept it.
"The man in black behaved rather suspiciously, as if trying not to be noticed."
The investigator was extremely suspicious of the suspect's alibi. The suspicious wife followed her husband when he left work.
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.
suspiciously