unable更倾向于客观不能,比如,because of the rain,I am unable to go.因为下雨,我不能去了
incapable更倾向于主观不能,这种“不能”是可以由学习或经验弥补的。 比如: Those incapable workers are sleeping all the day. 那些无能的工人睡了一整天了。 Before I become a qualified driver, I am incapable of driving cars.在我拿到驾照前,我是不能开车的。