Proto-Sino-Tibetan: *ŋŏŋ / *ŋŏk
Meaning: foolish, deaf
Kachin: ŋok2 be foolish.
Lushai: ŋoŋ (ŋon) be deaf; slow of understanding.
Comments: Cf. Austric: PAN *beŋaŋ, -ŋaŋ 'disconcert, confuse', *Renek 'silent, taciturn', PAA *ŋVŋ 'dumb', *ŋVk 'stupid'