noun
desire for revenge; vengeful thoughts
Refers to the emotional state of wanting to get back at someone; often used in literary or psychological contexts.
彼の心は復讐心で燃えていた。
His heart was burning with a desire for revenge.
復讐心に駆られて、彼は冷静さを失った。
Driven by vengeful thoughts, he lost his composure.
恨み is a broader grudge or resentment, not necessarily focused on revenge; 復讐心 specifically implies a wish to retaliate.
Compound of 復讐 (revenge) + 心 (heart/mind). The exact historical derivation is uncertain, but the word transparently combines these elements.