Untidy, a.
1. Unseasonable; untimely. [Obs.] "Untidy tales." Piers Plowman.
2. Not tidy or neat; slovenly. -- Un*ti"di*ly, adv. -- Un*ti"di*ness, n.
Shades of meaning
Fernald lists untidy only as an antonym, under neat.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given