adventurism
noun
ad·ven·tur·ism əd-ˈven-chə-ˌri-zəm 
: improvisation or experimentation (as in politics or military or foreign affairs) in the absence or in defiance of accepted plans or principles
adventurist
əd-ˈven-ch(ə-)rist
noun adventuristic
əd-ˌven-chə-ˈri-stik
adjective 
Example Sentences
Recent Examples on the Web European leaders should be outraged at China’s Vostok adventurism and reject deeper cooperation with Beijing. 
Tom Rogan, WSJ, 22 Aug. 2022 Concern about Soviet adventurism in Nicaragua and elsewhere guided the Central American FTA. Frank Lavin, Forbes, 8 Aug. 2022 The Court has been holding the line against liberal adventurism on a gradually lengthening list of issues for some decades, but with mixed results, especially on cultural issues. The Editors, National Review, 1 July 2022 So goes the ethos of Kisawa, a retreat radical in both its remoteness and freedom, where attentiveness is balanced with adventurism. Elise Taylor, Vogue, 17 June 2022 But this is Putin’s adventurism, and the left must stand firmly against it. Matthew Duss, The New Republic, 1 June 2022 Yet Russia's failure to take over the entire country and the unified Western response may serve as a red flag to military adventurism. Compiled Democrat-gazette Staff From Wire Reports, Arkansas Online, 24 May 2022 Yet Russia’s abject failure to take over the entire country and the unified Western response may serve as a red flag to military adventurism. Peter Baker, BostonGlobe.com, 23 May 2022 Yet Russia’s failure to take over the entire country and the unified Western response may serve as a red flag to military adventurism. New York Times, 23 May 2022 See More
Tom Rogan, WSJ, 22 Aug. 2022 Concern about Soviet adventurism in Nicaragua and elsewhere guided the Central American FTA. Frank Lavin, Forbes, 8 Aug. 2022 The Court has been holding the line against liberal adventurism on a gradually lengthening list of issues for some decades, but with mixed results, especially on cultural issues. The Editors, National Review, 1 July 2022 So goes the ethos of Kisawa, a retreat radical in both its remoteness and freedom, where attentiveness is balanced with adventurism. Elise Taylor, Vogue, 17 June 2022 But this is Putin’s adventurism, and the left must stand firmly against it. Matthew Duss, The New Republic, 1 June 2022 Yet Russia's failure to take over the entire country and the unified Western response may serve as a red flag to military adventurism. Compiled Democrat-gazette Staff From Wire Reports, Arkansas Online, 24 May 2022 Yet Russia’s abject failure to take over the entire country and the unified Western response may serve as a red flag to military adventurism. Peter Baker, BostonGlobe.com, 23 May 2022 Yet Russia’s failure to take over the entire country and the unified Western response may serve as a red flag to military adventurism. New York Times, 23 May 2022 See More Word History
Etymology
adventure entry 1 + -ism, in part after Russian avantjurizm
First Known Use
1932, in the meaning defined above