What might be an opposite of the word "grudgingly accept"?

Grudgingly accept means that you allow something, but you are not necessarily happy about. For example, a waitress might grudgingly accept a small tip, even though she thinks she deserves more.

The opposite of grudgingly, would be something like "willingly" or "resolutely". The opposite of "accept" would be something like "refuse". So the oppose of the phrase could be something like "resolutely refuse", but there are many more possibilities.