Truculent (adjective)

Eager to fight; defiantly aggressive; merciless.

Origin:

Late 16th century: from latin truculentus, from trux, truc- 'savage, fierce.'.

Examples:

1. The truculent teenager refused to back down.
2. The truculent boss threatened to fire anyone who disobeyed his orders.
3. The truculent dog barked at anyone who approached its owner.
4. The truculent bull charged at the matador, who managed to dodge out of the way.
5. The truculent soldier refused to surrender, even though he was vastly outnumbered.