expression, adverb
without complaining; without arguing; without grumbling; with good grace
Used to tell someone to stop making petty objections and just do something. Often an imperative or strong suggestion.
四の五の言わずに、さっさと宿題をやりなさい。
Stop complaining and just do your homework.
彼は四の五の言わずに引き受けてくれた。
He accepted without a word of complaint.
More literal 'without complaining'; 四の五の言わず is more idiomatic and implies stopping trivial objections.
From 四の五の (this and that, petty details) + 言わず (without saying). The exact origin of 四の五の is uncertain, but it likely refers to quibbling over small numbers.