1. 1〔益がないこと〕無駄な useless; (of) no use
    • 彼を説得しようとしても無駄だよ
    • It's useless [no use] to try to persuade him.
    • 彼に手紙を書いても無駄だ
    • It is no use writing to him.
    • 忠告をしても無駄だった
    • My advice to him was wasted [futile].
    • 今それを勉強しておくことは無駄にはなるまい
    • Studying this now will prove of use someday.
    • 彼には折角の心遣いも無駄だった
    • All our thoughtful consideration was lost on him.
    • やってみたが無駄だった
    • I did it 「in vain [to no purpose].
    • 努力がみな無駄になってしまった
    • All my efforts came to nothing.
  1. 2〔浪費〕(a) waste; wastefulness
    • 金を無駄にする
    • waste money/throw money away
    • そんなことは時間の無駄だ
    • It is a waste of time to do such a thing.
    • 彼の話には無駄がない
    • He never wastes his words./What he says is always to the point.
    • こうすれば大分無駄が省ける
    • This will eliminate much of the waste.
    • 時間を無駄にしてはいけない
    • Don't waste your time.
    • 書き出しを試行錯誤するその小説家は紙を何枚も無駄にした
    • In her effort to write a good first sentence for the story, the novelist spoiled [ruined] a lot of paper.