unassertive

adj.不武装的

不自信的；不果断的；不坚决的；不自强的。

形容词

1、She's very unassertive and always lets people walk all over her. 她非常不果断，总是让人们对她指手画脚。
2、He tends to be unassertive in group settings and often lets others make decisions for him. 他在集体环境中往往不果断，常常由他人代替做决定。