1. characterized by bitter, long-lasting resentment or hatred

Examples

• The divorce proceedings became increasingly rancorous as both sides refused to compromise.
• His rancorous comments about his former business partner surprised everyone.
• The political debate took a rancorous turn when personal attacks began.
• She harbored rancorous feelings toward her sister for years after the incident.
• The rancorous dispute between the neighbors eventually required legal intervention.
• Despite their rancorous history, the two companies agreed to merge.