8 letters · 10 points in Scrabble
adjective lacking or showing a lack of what is fitting and considerate in dealing with others
adjective revealing lack of perceptiveness or judgment or finesse
originEtymology tree English tact Proto-Indo-European *lewh₁- Proto-Indo-European *lewHs-der. Proto-Germanic *leusaną Proto-Germanic *lausaz Proto-Germanic *-lausaz Proto-West Germanic *-laus Old English -lēas Middle English -les English -less English tactless From tact + -less.
Etymology from Wiktionary, CC BY-SA 3.0