とんでもないtondemonai

1. i-adjectiveunthinkable; unexpected; absurd; outrageous; preposterous; terrible
   ジャックが音楽おんがくが苦手にがてなんてとんでもない、それどころか、ピアノを弾ひくのがうまい。↗

   It isn't true that Jack is no good at music; on the contrary, he plays the piano well.
2. interjectionabsolutely not!; far from it!; impossible!; preposterous!; what a thing to say!; no way!
   「君きみはそれを終おえたか」「とんでもない、始はじめたばかりだ」↗

   "Have you finished it?" "On the contrary, I've just begun."
3. interjection(it was) no bother at all; not at all; don't mention it

• Synonym法外ほうがいWrittenWritten/formal prose: describes prices or demands as outrageously excessive, as in 「法外な値段」; mostly used about money.
• RelatedありえないCasualColloquial: something impossible or unbelievable, as in 「ありえない！」; young people often use it to voice shock or disbelief.
• Related考えられないかんがえられないNeutralMeans unimaginable — beyond what one can conceive; a fairly objective statement, whereas 「とんでもない」 carries strong emotion.
• Antonym当然なNeutralAntonym: means only natural or a matter of course, the opposite of the unexpectedness of 「とんでもない」.

Use 「とんでもない」 (polite 「とんでもないです」) for something outrageous or unexpected, or as the humble reply 'far from it!'. Young people say 「ありえない」 for disbelief; 「法外」 suits outrageous prices or demands.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 意外いがいであるさま。
2. もってのほかであるさま。
3. 滅相めっそうもない。