one's heart is set against
(one's) heart is set against (something)
One is vehemently opposed to something or some action. After he moved to France, his heart was set against ever returning to London. I'm sorry, my heart is set against that color for the living room.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
one's heart is (dead) set against something
Fig. one is totally against something. Jane's heart is set against going to that restaurant ever again.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.