listless

languid, languorous, lackadaisical, listless, spiritless mean lacking energy or enthusiasm.

languid refers to an unwillingness or inability to exert oneself due to fatigue or physical weakness.

languorous suggests a dreamy boredom and delicacy that avoids unnecessary activity.

lackadaisical implies a carefree indifference marked by half-hearted efforts.

listless suggests a lack of interest caused by physical weakness or dissatisfied boredom.

spiritless refers to a lack of animation or vigor that gives one's actions and words life.