UNIQUE WORDS game to increase our vocabulary - alphabetical order

egregious - conspicuously and outrageously bad or reprehensible

garrulous - full of trivial conversation

Jackstall - in helicopters, it's a flight configuration when the M/R blades overpower the hydraulic servos - and the controls lock solid. (The procedure to recover from it, is to off-load the main rotor blade system.)

malapropism - misuse of a word by confusion with one that sounds similar

Obdurate - stubbornly refusing to change one's opinion or course of action.
"I argued this point with him, but he was obdurate

QUADRAGESIMAL - adjective, ARCHAIC
(of a fast, especially one in Lent) lasting forty days.
belonging or appropriate to the period of Lent.