tardily vs slowly

tardily and slowly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
tardily	No	No	No	Yes
slowly	No	No	No	Yes

As adverbs, tardily and slowly are synonyms defined as:

tardily and slowly: without speed (`slow' is sometimes used informally for `slowly')

Other synonyms of tardily include easy, slow.

tardily (adverb)	slowly (adverb)
without speed (`slow' is sometimes used informally for `slowly')	in music
later than usual or than expected	without speed (`slow' is sometimes used informally for `slowly')