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"tactless" is also used as a crossword clue. If that's what you saw, the answer is often insensitive (11 letters).
Definitions
revealing lack of perceptiveness or judgment or finesse
Word origin
From tact + -less.
Used in a sentence
“It was tactless of you not to attend your sister's wedding.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Lacking social sensitivity”8 letters
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