tasteless

adjective

1 the vegetables were watery and tasteless:

flavourless, bland, insipid, unappetizing, unflavoured, savourless, watered-down, watery, weak, thin, vapid, uninspired;

mild, boring, dull, uninteresting.

▷antonyms tasty, appetizing.

2 his suite is lined with tasteless leather burgundy panelling:

vulgar, crude, tawdry, garish, gaudy, loud, trashy, showy, ostentatious, cheap, cheap and nasty, gross, meretricious, inelegant;

informal flash, flashy, tatty, tacky, kitsch, naff.

▷antonyms tasteful, refined.

3 a tasteless remark:

crude, vulgar, low, gross, indelicate, uncouth, crass, tactless, undiplomatic, indiscreet, inappropriate, offensive, unacceptable.

▷antonyms seemly, tasteful.

tasteless Oxford Dictionary of English