1 in bad or poor taste, garish, gaudy, loud, tawdry, meretricious, cheap, flashy, unrefined, inelegant, unaesthetic; improper, wrong, indecorous, indelicate, uncultivated, uncouth, uncultured, gauche, boorish, maladroit, distasteful, unsavoury, coarse, crude, gross, vulgar, base, low:
That is the most tasteless dress I have ever seen. He made a tasteless remark about her table manners.
2 insipid, bland, dull, flat, watery, vapid, flavourless, unsavoury, Colloq wishy-washy:
The tea served there is completely tasteless.