noisy, earwax
聹 centers on unwanted sound or buildup in the ear: noise that disturbs, or earwax that blocks hearing. Both meanings connect to something unwanted affecting the ear.
聹 combines 耳 (ear) with 寧, which likely contributes the sound and may relate to the idea of something settled or accumulated in the ear, leading to the meanings of earwax or noise.
The ear 耳 is paired with 寧, which suggests something settled or lingering. Imagine earwax building up quietly, or noise that settles in the ear and won't leave.
For ネイ, picture a noisy ear that makes you say 'Nay!' to the sound: Nay -> ネイ, as you wish the noise would stop.