As adverbs the difference between sidlingly and siblingly
is that sidlingly is with a sidling motion while siblingly is in the manner of a sibling, behaving as one would expect of a sibling.
As an adjective siblingly is
pertaining to a sibling or siblings.
siblingly
English
Adjective
(
en adjective)
Pertaining to a sibling or siblings.
Adverb
(
en adverb)
In the manner of a sibling, behaving as one would expect of a sibling