What is this word?? Please read description! :)?

Okay, so you know that adverb (or adjective or whatever) that you can use to describe how a person does something, but still doesn't want to?? It starts with an R and sounds sort of like "resentful", "relentless" or something along those lines. You know, instead of saying something like "even though she didn't want to" you can use that word?? Ugh, I hate it when I forgot words...thanks in advance :)