Related Clues:

• Heavy and slow, as if weighted down with heavy metal
• Unwilling to yield or grant a point
• Obstinate, bullheaded
• Tenaciously unwilling to give in
• Obstinate, unwilling to yield
• Slow like heavy metal
• Slow-moving, being like heavy metal
• Heavy or slow, like dark-gray metal
• When the cigarette's dead, that seems to be what's happened to make one mullish
• Lean in a heavy way about the editor back there
• Ned turns heavy after the ale
• Showing dogged determination
• Never giving up Bob's turn at sea
• Butt originating with the head of a pig?
• Mulish objections raised and natural to follow