expression
by any means, fair or foul
Used when someone is willing to use any method, even unethical ones, to achieve a goal. Often carries a negative connotation.
彼は金のためなら手段を選ばずに行動する。
He acts by any means necessary for money.
目的のためには手段を選ばずに進む人もいる。
Some people proceed without choosing their means for the sake of their goal.
A fixed expression composed of 手段 (means), を (object marker), 選ばず (negative continuative of 選ぶ, 'to choose'), and に (adverbial particle). Literally 'without choosing means'.