rancoeur

listen to the pronunciation of rancoeur
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rancor
The deepest malignity or spite; deep-seated enmity or malice; inveterate hatred

I could almost see the rancor in his eyes when he challenged me to a fight.

malice
{i} hatred, animosity, enmity; bitterness, resentment, ill will
a feeling of deep and bitter anger and ill-will
A fictitious, feral creature in the Star Wars universe