Egregious
/ɪˈɡriː.dʒəs/ adjective mediumShockingly and obviously bad or wrong.
The referee's egregious missed call decided the outcome of the entire championship game.
Memory Trick
'E-' (out) plus 'greg' (flock, as in 'gregarious') — egregious once meant standing out from the herd; now it means standing out in a shockingly bad way.