cluelessadj.
英 'kluːlɪs | 美 'kluləs
中文adj. 无线索的；愚蠢的
词根词源
clueless (adj.)1862, "trackless," from clue (n.) + -less. Meaning "ignorant, uninformed" is from 1943, said to be RAF slang from 1930s. Student slang use by 1985 is perhaps an independent extension along the same line. Related: Cluelessly; cluelessness.
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