Unassertive (adjective)

1. Not confident or forceful in personality or behavior.
2. Not aggressively self-assured.

Origin:

Derived from the prefix 'un-' meaning 'not' and 'assertive' meaning 'having or showing a confident and forceful personality.'.

Examples:

1. The unassertive man struggled to assert himself in meetings.
2. The unassertive woman's ideas were often overlooked.
3. The unassertive child had trouble standing up for himself.
4. The unassertive employee was afraid to voice his opinions.
5. The unassertive dog was shy and easily intimidated.