without speed (`slow' is sometimes used informally for
`slowly'); "he spoke slowly"; "go easy here--the road is slippery"; "glaciers move tardily"; "please go slow so I can see the sights" Synonym(s):slowly, slow, easy, tardily Antonym(s):apace, chop-chop, quickly, rapidly, speedily
later than usual or than expected; "the train arrived late"; "we awoke late"; "the children came late to school"; "notice came so tardily that we almost missed the deadline"; "I belatedly wished her a happy birthday" Synonym(s):late, belatedly, tardily Antonym(s):ahead of time, early, too soon
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Tardily \Tar"di*ly\, adv.
In a tardy manner; slowly.