"tactless" in the adjective sense
1. tactless, untactful
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"
2. inept, tactless
revealing lack of perceptiveness or judgment or finesse
"an inept remark"
"it was tactless to bring up those disagreeable"
Source: WordNet® (An amazing lexical database of English)
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