妬む
ねたむ · netamu · JLPT N1 · verb-godan
to be jealous
妬 = 女 (woman) + 石 (stone): a stone-hard heart that burns with envy over another woman's luck
The left radical 女 (woman) marks the emotion as a feeling often linked to rivalry, and 石 (stone) on the right suggests the heart hardening. Together 妬 (ねた・む) hints at jealousy.