tasteless

adjective

1. having no taste or flavor; insipid.
2. dull; uninteresting.
3. lacking in aesthetic quality or capacity; devoid of good taste: a houseful of tasteless furnishings; a tasteless director of stale, dreary films.
4. lacking in politeness, seemliness, tact, etc.; unmannerly; insensitive: a tasteless remark.
5. lacking the physical sense of taste.

adjective

1. lacking in flavour; insipid
2. lacking social or aesthetic taste
3. rare unable to taste

adj.1590s, “unable to taste;” c.1600, “uninteresting;” 1610s, “insipid;” 1670s, “tactless;” from taste (n.) + -less. Related: Tastelessly; tastelessness.