Definition of egregious adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪˈɡriːdʒiəs//
; NAmE NAmE//ɪˈɡriːdʒiəs//
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extremely bad egregious behaviour an egregious error Word Originmid 16th cent. (originally meaning remarkably good): from Latin egregius ‘illustrious’, literally ‘standing out from the flock’, from ex- ‘out’ + grex, greg- ‘flock’. The current sense probably arose as an ironical use.
See the Oxford Advanced American Dictionary entry: egregious