circumstantially vs accidentally

circumstantially and accidentally both are adverbs.

Word	Noun	Adjective	Verb	Adverb
circumstantially	No	No	No	Yes
accidentally	No	No	No	Yes

As adverbs, circumstantially and accidentally are synonyms defined as:

Other synonyms of circumstantially include by chance, unexpectedly.

circumstantially (adverb)	accidentally (adverb)
insofar as the circumstances are concerned	without advance planning
without advance planning	without intention; in an unintentional manner
in minute detail	of a minor or subordinate nature
according to circumstances