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