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とんでも

not at all; certainly not

adverb Rare #41,672
not at all; certainly not Commonly used in the polite set phrases とんでもありません and とんでもございません, often in response to thanks or praise. Some consider these forms nonstandard, but they are widely used.
JA: とんでもありません。お役に立ててよかったです。
EN: Not at all. I’m glad I could help.

とんでもございません

Not at all.

— 紅夢 (1991)

とんでもありません！

Not at all!

とんでもございません！

Not at all!

とんでもありません

Not at all.

— 紅夢 (1991)