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English word clueless comes from English -less (Lacking (something); without (something).), English clue.

Clueless etymology ?

Clueless detailed word origin explanation

Dictionary entryLanguageDefinition
-less English (eng) Lacking (something); without (something).
clue English (eng) To provide someone with information which he or she lacks (often used with "in" or "up").. To provide with a clue. (now, _, rare) A strand of yarn etc. as used to guide one through a labyrinth; something which points the way, a guide.. (slang) Insight or understanding ("to have a clue [about]" or "to have clue". See have a clue, clue stick). An object or a kind of indication which may be [...]
clueless English (eng) Lacking knowledge or understanding; uninformed.

Words with the same origin as clueless

Descendants of -less
breathless countless defenseless fearless flawless hopeless meaningless merciless needless penniless pointless priceless regardless relentless ruthless selfless senseless sleepless thoughtless timeless toothless topless useless wireless