Synonyms for Tactless:

adj.

all (adjective)
inept, untactful.
discourteous (adjective)
disrespectful, brutish, coarse, ill-mannered, rude, barbarous, uncouth, impolite, uncivil, caddish, crude, brash, uncivilized, vulgar, contemptuous, discourteous, impertinent.
indiscreet (adjective)
insensitive, indiscreet, unselective, undiscerning, obtuse.
inelegant (adjective)
brutish, tawdry, rude, tasteless, gawky, inelegant, raw, vulgar, undignified, gross, barbarous, uncivil, boorish, earthy, crude, awkward, clumsy, unrefined, graceless, coarse, unpolished.
thoughtless (adjective)
unthoughtful.
unthinking, careless (adjective)
rash, gruff, brash, uncivil, rude, insensitive, vulgar, undiplomatic, misunderstanding, indelicate, clumsy, unpolished, inept, impolite, maladroit, rough, gauche, crude, inconsiderate, boorish, imprudent, hasty, unperceptive, indiscreet, unsympathetic, awkward, impolitic, discourteous, untactful.
vulgar (adjective)
common, cheap, boorish, vulgar, gaudy, broad, low, revolting, gross, in bad taste, ignoble, tasteless, degraded, rude, shameless, barbaric, philistine, ignominious, inelegant, brazen, crass, graceless, undignified, rank, profane, homespun, rough, colloquial, garish, sleazy, brutish, obscene, animal, indelicate, scandalous, repulsive, crude, salty, earthy, depraved, clumsy, coarse, cockney, raw, tawdry, unbecoming, sordid, chintzy, unrefined, ill-bred, unseemly, base, idiomatic, glaring, barnyard, outlandish, offensive, unpolished, coarse-grained.

n.

careless, complacent, slipshod, perfunctory, remiss, lackadaisical, complacency, like a bull in a china shop, casual. ability, gauche, courtesy, Unpolitic. tactless (noun)
inept, impolitic, untactful, undiplomatic, maladroit.
undiplomatic (noun)
hasty, imprudent, misunderstanding, inconsiderate, gruff, unthoughtful, unsympathetic, gauche, rash, unperceptive.

Other synonyms:

Unpolitic. uncouth
gauche.
Other relevant words:
hasty, Unpolitic, maladroit, gruff, impolitic, undiplomatic, unthoughtful, unperceptive, rash, gauche, inept, perfunctory, careless, casual, unsympathetic, misunderstanding, inconsiderate, imprudent, untactful.

Usage examples for tactless

  1. With these limitations Poe, as might be expected, had a very defective sense of humor, lacked true sympathy, was tactless possessed little business ability, and was excessively annoyed by the dull routine and rude frictions of ordinary life. – Selections From Poe by J. Montgomery Gambrill
  2. " Well, that greatly depends upon taste," returns Molly, who, though angry, finds a grim amusement in watching the flounderings of this tactless old person. – Molly Bawn by Margaret Wolfe Hamilton
  3. And immediately he was sorry that his tactless query had swung the conversation to bear upon her father, the thought of whom could not but prove painful to her. – The Black Bag by Louis Joseph Vance