Her aggressive attitude during the meeting was concerning.

aggressive 来自动词 aggress（侵略、攻击），加上形容词后缀 -ive 构成形容词形式。aggressive 的意思是"侵略性的、咄咄逼人的"，形容一个人表现出强势、好斗或不顾他人感受的行为方式。