The Collaborative International Dictionary of English v.0.48:
Stiff-necked \Stiff"-necked`\, a. Stubborn; inflexibly obstinate; contumacious; as, stiff-necked pride; a stiff-necked people. --Ex. xxxii. 9. [1913 Webster]WordNet (r) 3.0 (2006):
stiff-necked adj 1: haughtily stubborn; "a stiff-necked old Boston brahmin"