Used when an action is taken immediately, without hesitation or postponement. Often found in formal or written contexts.
猶予なく決断を下す必要がある。
We need to make a decision without delay.
彼は猶予なく返事をした。
He replied promptly.
From 猶予 (ゆうよ, 'delay, hesitation') + なく (adverbial form of ない, 'not'). Literally 'without delay'.