He's 'resentful' of his boss. = He feels 'resentful' toward his boss.
She is 'resentful' about being demoted.
a 'resentful' letter to the editor
(..) Just no grab-ass from you, okay? - Erica, Renee: What? No. - Anton: Hey, let's do it. I can't feel my toes. You know that I have always been a little bit resentful that you've hooked up with Anton. So this is a way to fix that forever. I'm really enjoying (..)2009 The Black Waters of Echo's Pond