Adjective

(en-adj)

Having, or capable of exerting power, potency or influence.

* (William Shakespeare)

The powerful grace that lies / In herbs, plants, stones, and their true qualities.

*{{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=19 citation , passage=As soon as Julia returned with a constable, Timothy, who was on the point of exhaustion, prepared to give over to him gratefully. The newcomer turned out to be a powerful youngster, fully trained and eager to help, and he stripped off his tunic at once.}}

(mining) Large; capacious; said of veins of ore.

Adjective

(en adjective)

Stubbornly persistent, generally in wrongdoing; refusing to reform or repent.

* Hooker

The very custom of evil makes the heart obdurate against whatsoever instructions to the contrary.

* Shakespeare

Art thou obdurate , flinty, hard as steel, / Nay, more than flint, for stone at rain relenteth?

* 1818 , ,"The Revolt of Islam", canto 4, stanza 9, lines 1486-7:

But custom maketh blind and obdurate

The loftiest hearts.

* {{quote-news

, year=2011 , date=February 12 , author=Les Roopanarine , title=Birmingham 1 - 0 Stoke , work=BBC citation , page= , passage=An injury-time goal from Nikola Zigic against an obdurate Stoke side gave Birmingham back-to back Premier League wins for the first time in 14 months.}}

(obsolete) Physically hardened, toughened.