Etymology
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tactless (adj.)

"characterized by want of tact," 1830, from tact + -less. Related: Tactlessly; tactlessness.

updated on January 20, 2014

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Definitions of tactless from WordNet

tactless (adj.)
lacking or showing a lack of what is fitting and considerate in dealing with others;
in the circumstances it was tactless to ask her age
Synonyms: untactful
tactless (adj.)
revealing lack of perceptiveness or judgment or finesse;
it was tactless to bring up those disagreeable
Synonyms: inept
From wordnet.princeton.edu, not affiliated with etymonline.