Neutral:
* Reserved: This implies someone who is quiet and doesn't share their thoughts easily.
* Unassertive: This describes someone who lacks confidence in expressing their opinions.
* Submissive: This suggests someone who avoids conflict and is easily swayed by others.
* Passive: This describes someone who doesn't take initiative or express their needs.
Negative:
* Spineless: This is a harsh term for someone who lacks courage and doesn't stand up for themselves.
* Cowardly: This refers to someone who avoids confrontation and doesn't express their true feelings.
* Doormat: This describes someone who is easily taken advantage of and doesn't assert their own boundaries.
* Acquiescent: This refers to someone who readily submits to the will of others.
* Afraid: This implies fear as the reason for not speaking their mind.
Positive:
* Diplomatic: This can be used if the person is tactful and avoids conflict for the sake of harmony.
* Considerate: This describes someone who thinks about the impact of their words on others.
* Humble: This can apply if someone is self-effacing and avoids boasting or being assertive.
It's important to choose the word that best describes the specific situation and the person's motivations.