Sentence:  And all the unsettled humours of the land, / Rash, <WSD>inconsiderate</WSD>, fiery voluntaries, ... / Have sold their fortunes at their native homes, / Bearing their birthrights proudly on their backs, / To make hazard of new fortunes here: 
Meaning of the word marked with <WSD> tags:  Not giving enough consideration to one's actions, conclusions, etc.; acting too quickly without considering the risks and consequences.