Tasteless, a.
1. Having no taste; insipid; flat; as, tasteless fruit.
2. Destitute of the sense of taste; or of good taste; as, a tasteless age. Orrery.
3. Not in accordance with good taste; as, a tasteless arrangement of drapery. -- Taste"less*ly, adv. -- Taste"less*ness, n.
Shades of meaning
Fernald lists tasteless only as an antonym, under racy.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given