あげる but in an unwelcomed manner Taking an example . This means to eat for someone else' sake (in favour of someone else). What if I wanted to say I am sorry for eating it, it would be wrong to say . Is there a word to replace in this case? Something like but the person doing the action is myself (first person).

There is no grammar for giving negative _favor_. What you mentioned () tells negative _honorific_ , which is another category.

It is possible to use favor verbs ironically, but even if so, it only makes sense by pretending a good will, thus won't work anyway.

You can only say () which lets connote unexpected (and unfavorable) outcomes.