The definition of galling is something very annoying or upsetting.
When you lose a contest to your bitter rival, this is an example of when the loss is galling.
chafing; very annoying; irritating; vexing
Origin of gallingpresent participle of gall
Causing extreme irritation or chagrin; vexing: a galling delay; a galling setback to their plans.
- Present participle of gall.
From gall + -ing. The adjective follows from the verb.