rancour
noun /ˈræŋkə(r)/
  /ˈræŋkər/
(North American English rancor)
 [uncountable] (formal)- feelings of hate and a desire to hurt other people, especially because you think that somebody has done something unfair to you synonym bitterness
- There was rancour in his voice.
 - They divorced with remarkably little rancour.
 - without rancour She learned to accept criticism without rancour.
 
Word OriginMiddle English: via Old French from late Latin rancor ‘rankness’ (in the Vulgate ‘bitter grudge’), related to Latin rancidus ‘stinking’.