unfitness

例句：

1. 1. The doctor advised him to avoid heavy exercise due to his unfitness.
   由于他的不适合，医生建议他避免剧烈运动。
2. 2. The new policy is designed to improve the overall fitness of the population.
   新政策旨在提高人口的整体健康水平。
3. 3.She felt unfitness for the task at hand.
   她觉得自己不适合这项任务。