Definition of rancorous adjective from the Oxford Advanced Learner's Dictionary

 

rancorous

 adjective
adjective
BrE BrE//ˈræŋkərəs//
 
; NAmE NAmE//ˈræŋkərəs//
 
(formal)
 
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having or showing feelings of hatred and a desire to hurt other people, especially because you think that somebody has done something unfair to you synonym bitter (1) a rancorous legal battle The talks became increasingly bitter and rancorous.