Feisty (adjective)

1. Full of energy and spirit; lively and determined.
2. Having a strong and determined character; not easily intimidated or discouraged.

Origin:

Early 19th century (in the sense "small and lively"): perhaps from feist, a small dog of a type that was used for hunting small game.

Examples:

1. She may be small, but she's feisty and not afraid to speak her mind.
2. He's known for being a feisty competitor, never backing down from a challenge.
3. She"s a feisty young woman who"s not afraid to stand up for what she believes in.
4. He's a feisty old man who refuses to let his age slow him down.
5. Feisty debates are common in the company's board meetings.