Related Clues:

• Obstinate, unwilling to yield
• When the cigarette's dead, that seems to be what's happened to make one mullish
• 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
• Refractory
• Won't listen to anyone that Robert is twisted and in a daze
• Unyielding, as the remaining part delivered
• Tough to budge
• Obstinate, mulish
• Part of the ticket delivered by difficult person
• Unreasonably unwilling to change
• Resistant to change
• Rejected objections, fated to be intractable