expression, adverb
without showing any sign of; without giving the slightest indication of; without breathing a word of
Used when someone hides their true feelings, intentions, or knowledge completely. Often followed by a verb like ～ない or ～ず.
彼は驚きをおくびにも出さず、冷静に答えた。
He answered calmly, without showing any sign of surprise.
彼女は秘密を知っていることをおくびにも出さなかった。
She didn't give the slightest indication that she knew the secret.