Having no knowledge, understanding, or awareness about something; completely uninformed.
Formed from 'clue' plus the suffix '-less' meaning without. 'Clue' originally came from 'clew,' meaning a ball of yarn, referencing the thread that helped Theseus escape the Minotaur's labyrinth in Greek mythology.
The journey from 'clew' (ball of yarn) to 'clue' (hint) to 'clueless' (ignorant) represents one of English's most poetic etymological paths. It's remarkable how Ariadne's thread in ancient Greek myth still influences how we talk about understanding and confusion today.
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