Egregious

1. Usually in a negative sense: conspicuous, exceptional, outstanding.
2. Outrageously bad; shocking.

Usage notes

The negative meaning arose in the late 16th century, probably originating in sarcasm. Before that, it meant outstanding in a good way. Webster also gives “distinguished” as an archaic form, and notes that its present form often has an unpleasant connotation (for example, “an egregious error”). It generally precedes such epithets as ass, blunderer, rascal, and rogue. The Italian as well as Spanish cognate egregio has retained a strictly positive sense, as has the Portuguese cognate egrégio.