Etymology
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egregious (adj.)

1530s, "distinguished, eminent, excellent," from Latin egregius "distinguished, excellent, extraordinary," from the phrase ex grege "rising above the flock," from ex "out of" (see ex-) + grege, ablative of grex "a herd, flock" (from PIE root *ger- "to gather").

Disapproving sense, now predominant, arose late 16c., originally ironic. It is not in the Latin word, which etymologically means simply "exceptional." Related: Egregiously; egregiousness.

updated on January 29, 2018

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Definitions of egregious from WordNet

egregious (adj.)
conspicuously and outrageously bad or reprehensible;
an egregious lie
Synonyms: crying / flagrant / glaring / gross / rank
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.