must not; may not
Archaic prohibitive adverb, typically used in the pattern …することまな. Found in classical Japanese texts; not used in modern speech.
In old documents, expressions like 'you must not deceive' can be found.
Kana spelling for search convenience; the word is archaic and not normally written in kana in modern texts.
Alternate archaic kanji form; equally rare.
Archaic prohibitive adverb, likely related to the classical auxiliary まし and the negative な. The exact derivation is uncertain.