Source : Webster's Revised Unabridged Dictionary (1913)

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.

         The egregious impudence of this fellow.  --Bp. Hall.

         His [Wyclif's] egregious labors are not to be
         neglected.                               --Milton.

Source : WordNet®

egregious
     adj : conspicuously and outrageously bad or reprehensible; "a
           crying shame"; "an egregious lie"; "flagrant violation
           of human rights"; "a glaring error"; "gross
           ineptitude"; "gross injustice"; "rank treachery" [syn:
           {crying(a)}, {flagrant}, {glaring}, {gross}, {rank}]