Adjective

(en adjective)

Devoted; loyal; conscientious.

* {{quote-magazine, date=2013-06-07, author=David Simpson

, volume=188, issue=26, page=36, magazine=(The Guardian Weekly) , title= Fantasy of navigation , passage=Like most human activities, ballooning has sponsored heroes and hucksters and a good deal in between. For every dedicated scientist patiently recording atmospheric pressure and wind speed while shivering at high altitudes, there is a carnival barker with a bevy of pretty girls willing to dangle from a basket or parachute down to earth.}}

Adjective

(er)

Refusing to move or to change one's opinion; obstinate; firmly resisting.

He is pretty stubborn about his political beliefs, so why bother arguing?

Blood can make a very stubborn stain on fabrics if not washed properly.