Nonassertive and Unenterprising

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

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

Unenterprising adjective - Lacking in enterprise; not bold or venturesome.

Nonassertive and unenterprising are semantically related. You can use "Nonassertive" instead an adjective "Unenterprising".