Merriam-Webster Online Dictionary

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One entry found for disconcert.
Main Entry: dis·con·cert
Pronunciation: "dis-k&n-'s&rt
Function: transitive verb
Etymology: obsolete French disconcerter, alteration of Middle French desconcerter, from des- dis- + concerter to concert
Date: 1687
1 : to throw into confusion
2 : to disturb the composure of
synonym see EMBARRASS
- dis·con·cert·ing adjective
- dis·con·cert·ing·ly /-ti[ng]-lE/ adverb
- dis·con·cert·ment /-m&nt/ noun