assertiveness

From assertive + -ness.

assertiveness (usually uncountable, plural assertivenesses)

1. The quality of being assertive.
   • 1914, Ernest Bramah, Max Carrados:

     "Mr Carrados and I will finish our investigation in my room," interposed Straithwaite, with quiet assertiveness. "I should advise you to lie down for half-an-hour, Stephanie, if you don't want to be a nervous wreck to-morrow."

• self-assertiveness