Proto-Turkic: *bun-
Meaning: 1 to become mad, foolish 2 mad, crazy 3 to become old, senile
Russian meaning: 1 сходить с ума, глупеть 2 сумасшедший, слабоумный 3 дряхлеть
Old Turkic: mun- 1, muŋqul 2 (OUygh.)
Turkish: buna- 1
Turkmen: mun- 3
Khakassian: munu- 3
Yakut: mun- 'to go astray'
Dolgan: mun- 'go astray, lose one's way'
Tuva: muŋɣaq 'resentful', mɨnɨ- 3 (Todž.), muŋ dial. 2 (< *mun-k?)
Gagauz: bun- 'to be tired, dissatisfied', bunaq 'senile person'
Karaim: buna- 1, 3
Salar: munax 'irrational' (ССЯ)
Comments: VEWT 514, EDT 348, 768, 769, ОСНЯ 3, 53, Stachowski 181.
