peaceful
甯 centers on a state of peacefulness or tranquility, likely as a personal name or rare literary term.
甯 is a rare character composed of 宀 (roof) over 心 (heart) and 用. The exact historical development is uncertain, but the structure likely suggests a heart at peace under a roof.
Under a roof 宀, a heart 心 rests on a sturdy base 用, creating a peaceful, settled feeling.
For ネイ, imagine a peaceful neigh from a horse resting under a roof: neigh -> ネイ, and the calm horse embodies the peaceful meaning.