self-defeating

[ self-di-fee-ting, self- ]
/ ˈsɛlf dɪˈfi tɪŋ, ˌsɛlf- /
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adjective

serving to frustrate, thwart, etc., one's own intention or interests: His behavior was certainly self-defeating.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for self-defeating

self-defeating


adjective

(of a plan, action, etc) unable to achieve the intended result
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