とんでもない
とんでも無い
tondemo nai

i-Adjective

1. unthinkable; unexpected; absurd; outrageous; preposterous; terrible

Usually Written in Kana
ジャックが音楽おんがく苦手にがてなんてとんでもない、それどころか、ピアノをくのがうまい。
jakkuga ongakuga nigatenante tondemonai soredokoroka pianō hiku noga umai.
It isn't true that Jack is no good at music; on the contrary, he plays the piano well.
Interjection

2. absolutely not!; far from it!; impossible!; preposterous!; what a thing to say!; no way!

Usually Written in Kana
「君きみはそれをえたか」「とんでもない、始はじめたばかりだ」
"kimiwa soreo oetaka" "tondemonai hajimetabakarida"
"Have you finished it?" "On the contrary, I've just begun."
Interjection

3. (it was) no bother at all; not at all; don't mention it

Usually Written in Kana
Other forms: