From Longman Dictionary of Contemporary Englishgallinggal‧ling /ˈɡɔːlɪŋ $ ˈɡɒː-/ adjective ANGRYmaking you feel upset and angry because of something that is unfair SYN annoying The most galling thing is that the guy who got promoted is less qualified than me.
Examples from the Corpus
galling• I felt that she had got much more charm and she was younger as well, which made it all the more galling.• However, what is most galling is the inactivity of the party which is supposed to represent labour.• It was just too galling, seeing him all dressed up for some one else.• He says he finds it's galling that that animals have suffered and they need not have.• It was galling to her to observe his change in demeanour.• It's always galling when people blame the victim for being careless. 