とんでもありません
Japanese
editEtymology
editFrom the adjective とんでもない by replacing ない with ありません.
Interjection
editとんでもありません • (tondemoarimasen)
Usage notes
editCommonly considered a mistake because とんでもない is handled as an adjective in modern Japanese grammar and replacing the ない with ありません to make a polite form is thus a mistake according to the grammar. Although etymologically とんでもない is not a single word but an expression (途でもない), it is used like a single word today except for the non-standard polite forms とんでもありません and とんでもございません.