Sentence:  The aristocratic class that the free-living, <WSD>hot-natured</WSD> pirate leaders had founded, and the unrestrained passions of the dukes replenished from generation to generation, were ever on the watch for an opportunity to break loose from all rule, and goven themselves and the native tillers of the soil that lay beneath them at their own sole discretion. 
Meaning of the word marked with <WSD> tags:  Highly emotional and impulsive.