kindness
嚀 centers on kindness expressed through gentle, caring speech or manner. The single given meaning 'kindness' is its conceptual core.
嚀 combines 口 (mouth) with 寧, which likely contributes both sound and the idea of peaceful, gentle expression. The exact historical development is uncertain.
A mouth 口 speaking peaceful, calming words 寧: imagine someone softly saying kind things to soothe a friend.
For ネイ, picture a kind neighbor named Nay who always speaks gently: Nay -> ネイ, and her mouth 口 brings peace 寧.
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