clueon Basic wordsalso onCEFR Upper intermediate (B2)? Band 3 (BND3)? 提示,线索 clueless clueless(adjective) 愚蠢的,无线索的 clues clues(noun) 线索,蛛丝马迹(clue的复数) clue clue(noun) 提示,线索 Forms adjectivenoun clueless clues clue