Dictionary.com
definitions

adventurism

[ad-ven-chuh-riz-uh m]
noun
  1. defiance or disregard of accepted standards of behavior.
  2. rash or irresponsible policies, methods, or actions, especially in political or international affairs.

Origin of adventurism

1835–45; adventure + -ism, as translation of Russian avantyurízm
Related formsad·ven·tur·ist, nounad·ven·tur·is·tic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for adventurist

adventurism

noun
  1. recklessness, esp in politics and finance
Derived Formsadventurist, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012