languish

(verb) lose vigor, health, or flesh, as through grief. Synonyms: pine away, waste. Example: "After her husband died, she just pined away."

(verb) have a desire for something or someone who is not present. Synonyms: ache, yearn, yen, pine. Examples: "She ached for a cigarette." "I am pining for my lover."

(verb) become feeble. Synonyms: fade. Example: "The prisoner has be languishing for years in the dungeon."