UNIQUE WORDS game to increase our vocabulary - alphabetical order

Martinet - a strict disciplinarian, especially in the armed forces.
"the woman in charge was a martinet who treated all those beneath her like children"

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.

Scofflaw - a person who flouts the law, especially by failing to comply with a law that is difficult to enforce effectively

umbrage
a feeling of anger caused by being offended

Such men are easily offended, take umbrage at trifles, and are unforgiving in their resentments. 
Sleeper, John Sherburne

warren
a series of underground tunnels occupied by rabbits

Their entrances were cunningly contrived to look like rabbit holes, so that strangers might think they led to nothing more than some sandy warren. 
Gask, Lilian

yokel
a person who is not intelligent or interested in culture

Abactor - One who steals and drives away cattle or beasts by herds or droves; a cattle rustler