無駄口 むだぐち Also written ムダ口, 徒口 Meanings Noun chatter; idle talk Kanji 無 without. Read as ム. 駄 useless 口 mouth. Read as くち. Example sentences 無駄口をたたくな。Don't waste your breath. Words containing 無駄口 無駄口をたたく (むだぐちをたたく) to chatter pointlessly Jinuma: Japanese Dictionary · Word lists