1. 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 • Syn: untactful • Ant: tactful • See Also: inconsiderate, inelegant • Derivationally related forms: tactlessness 2. revealing lack of perceptiveness or judgment or finesse - an inept remark - it was tactless to bring up those disagreeable • Syn: inept • Similar to: maladroit • Derivationally related forms: tactlessness, ineptness (for: inept)