unassertively, she always follows her husband's suggestions.    From Wordnet, Princeton University. 

Adjective : He is too assertive as a salesman.    From Dictionary.com. 

Givhan contrasted Clinton's decolletage with the more abundant display by Jacqui Smith, the new British home secretary, and her complaint seemed to be that Clinton was showing too little, too unassertively.    From Wordnik.com.  [Archive 2007-07-01] Reference