slowly vs tardily

slowly and tardily both are adverbs.

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

As adverbs, slowly and tardily are synonyms defined as:

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

Other synonyms of slowly include easy, slow.

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