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From The Collaborative International Dictionary of English v.0.48:
Egregious \E*gre"gious\ (?; 277), a. [L. egregius; lit., separated or chosen from the herd, i. e., distinguished, excellent; e out + grex, gregis, herd. See Gregarious.] Surpassing; extraordinary; distinguished (in a bad sense); -- formerly used with words importing a good quality, but now joined with words having a bad sense; as, an egregious rascal; an egregious ass; an egregious mistake. [1913 Webster] The egregious impudence of this fellow. --Bp. Hall. [1913 Webster] His [Wyclif's] egregious labors are not to be neglected. --Milton. [1913 Webster]