From Longman Dictionary of Contemporary Englishadventurismad‧ven‧tur‧is‧m /ədˈventʃərɪzəm/ noun [uncountable] when someone who is in charge of a government, business, army etc takes dangerous risks
Examples from the Corpus
adventurism• But above all Fitzgerald envied Hemingway's vigorous worldliness, his swagger and adventurism.• The great majority of revolutionary populists resolutely rejected the deception and unprincipled adventurism of a few untypical deviants like Nechaev. 