Assertive (adjective)

1. Confident and direct in claiming one"s rights or putting forward one"s views.
2. Able to stand up for oneself.

Origin:

Early 20th century: from assert + -ive.

Examples:

1. He was assertive in negotiating the deal.
2. She was assertive in expressing her opinion.
3. He was assertive in standing up for his beliefs.
4. She was assertive in asking for a raise.
5. He was assertive in defending himself.