/ dɪˈfiːtɪst; NAmE / adjective
expecting not to succeed, and showing it in a particular situation :
a defeatist attitude / view
► de·feat·ist noun :
He is a pessimist and a defeatist.
► de·feat·ism noun [ U ]
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WORD ORIGIN
early 20th cent.: from French défaitiste , from défaite defeat.