adverb
fluently; without hesitation; smoothly
Describes speaking, writing, or performing an action in a flowing, uninterrupted manner, without stumbling or pausing.
彼女はよどみなく英語を話す。
She speaks English fluently.
彼はよどみなく質問に答えた。
He answered the questions without hesitation.
From 淀み (stagnation, pause) + 無く (without). The word 淀む originally refers to water stagnating, and by extension to hesitation or faltering in speech.