Nonassertive and Unaggressive

Nonassertive adjective - Not aggressively self-assured, though not necessarily lacking in confidence.

Unaggressive and nonassertive are semantically related. In some cases you can use "Unaggressive" instead an adjective "Nonassertive".

Unaggressive adjective - Not aggressive; not given to fighting or assertiveness.

Nonassertive and unaggressive are semantically related. You can use "Nonassertive" instead an adjective "Unaggressive".