Temperamentally means because of someone's basic nature or related to someone's basic nature.
例句
He is a quitter who is temperamentally unsuited to remaining a champion.他是个遇难而退的人，照他的性格，不可能长期保住冠军的称号。
英汉词典释义
adv.
在气质上
He’s got all the right qualifications but is temperamentally unsuitable.他具备所需要的一切合格证件, 惟独性情不适合。Although they are twins, temperamentally they are as like as chalk to cheese.尽管他们是孪生儿，但性格却截然不同。