Assertive
Part of speech: adjective
Definition: boldly self-assured; aggressively confident; cocky
Example sentence: I think naturally, if you're an actor, there's a high level of assertiveness that you need to have to survive this business. There's boldness in being assertive, and there's strength and confidence.
Aggressive
Part of speech: adjective
Definition: Tending or disposed to aggress; characterized by aggression; making assaults; unjustly attacking.
Example sentence: In known history, nobody has had such capacity for altering the universe than the people of the United States of America. And nobody has gone about it in such an aggressive way.