Source : Webster's Revised Unabridged Dictionary (1913)

Stiff-necked \Stiff"-necked`\, a.
   Stubborn; inflexibly obstinate; contumacious; as,
   stiff-necked pride; a stiff-necked people. --Ex. xxxii. 9.

Source : WordNet®

stiff-necked
     adj : haughtily stubborn; "a stiff-necked old Boston Brahmin"