Use 'egregious' to emphasize the severity and negativity of a situation or action. His behavior at the party was egregious, causing everyone to leave early.
Pro Tip 2/3
Not for Minor Mistakes
Reserve 'egregious' for very serious mistakes, not for small or common errors. Forgetting her birthday was an egregious oversight in their relationship.
Pro Tip 3/3
Strong Disapproval
'Egregious' often conveys a strong sense of disapproval or condemnation. The judge described the defendant's conduct as egregious and sentenced him accordingly.