Definition of unctuous
Definition 3 is the winner. I always felt ungrateful that I rejected my mother's gratitude. I was working on a word builder game and this was one of the new words. The irritating thing for me she has this over the top gushing thank you in front of people but privately she throws away whatever I gave her. She'll thank me profusely for something small I did or offer to pay me, then tell my Dad she wishes I wouldn't come around. For years, I tuned out her thank yous, now I have a word to fit why it is a good idea to tune her out.