virtually vs well-nigh

virtually and well-nigh both are adverbs.

Word	Noun	Adjective	Verb	Adverb
virtually	No	No	No	Yes
well-nigh	No	No	No	Yes

As adverbs, virtually and well-nigh are synonyms defined as:

virtually and well-nigh: (of actions or states) slightly short of or not quite accomplished; all but

Other synonyms of virtually include about, almost, most, near, nearly, nigh.

virtually (adverb)	well-nigh (adverb)
in essence or effect but not in fact	(of actions or states) slightly short of or not quite accomplished; all but
(of actions or states) slightly short of or not quite accomplished; all but