Adjective (い)
Usually written in kana
1.  unthinkable;  unexpected;  absurd;  outrageous;  preposterous;  terrible
Interjection
Usually written in kana
2.  absolutely not!;  far from it!;  impossible!;  preposterous!;  what a thing to say!;  no way!
3.  (it was) no bother at all;  not at all;  don't mention it