Egregious

/ɪˈɡriː.dʒəs/ adjective medium

Shockingly 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.