IPA: //ˈtæktləs//
KK: /ˈtæktləs/
Not being sensitive to others' feelings; often saying or doing things that are rude or inappropriate.
His tactless comments made everyone uncomfortable at the dinner party.
Tactless → It is formed from "tact" (from Latin "tactus", meaning touch or sense) and "-less" (meaning without). The word "tactless" describes a lack of sensitivity or consideration in dealing with others, as if one is without the ability to touch or sense social nuances.
Think of 'tact' as the ability to sense or touch social situations, and remember that 'tactless' means being without that sensitivity.