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"
Egregious means very bad indeed. the most egregious abuses of human rights. = grievous. an egregious mistake, failure, problem etc is extremely bad and noticeable (egregius , from grex )
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