This is the 8591st most frequent Japanese word.
揺ぎ
"揺ぎ" (ゆるぎ) means "shaking" or "trembling."
In this sentence, 揺ぎない is used as an adjective meaning 'unwavering,' describing the steadfastness of the belief.
彼の信念は揺ぎない。
His belief is unwavering.
In this sentence, 揺ぎました is the past tense form of 揺ぎ, used as a verb meaning 'to sway,' describing the trees' motion.
強風で木々が揺ぎました。
The strong wind caused the trees to sway.
In this sentence, 揺ぎ動いた is a compound verb form using 揺ぎ, meaning 'to stir' or 'to move emotionally,' focusing on the impact of the sound on feelings.