Jisho

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Noun, Archaic/formal form of na-adjective
1. sudden; abrupt; unexpectedArchaic, See also 頓に とみに, See also 頓と とんと
Noun, Archaic/formal form of na-adjective
2. stupid; foolishArchaic, Only applies to とん
Noun
3. attaining enlightenment in one effort (without ascetic practices, etc.)Buddhism, Only applies to とん
Other forms
頓 【とん】頓 【とに】

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