RichThesaurus
bafflingly
vs
surreptitiously
bafflingly
adv
In a baffling or puzzling manner.
surreptitiously
adv
In a surreptitious manner; stealthily, furtively, secretly.
How often have the words
bafflingly
and
surreptitiously
occurred in a corpus of books?
(source:
Google Ngram Viewer
)