be (as) stubborn as a mule
(redirected from be as stubborn as a mule)be (as) stubborn as a mule
To be very devoted to a particular opinion or course of action, especially when faced with opposition. My toddler is as stubborn as a mule and has a tantrum every night at bedtime because he doesn't want to stop playing. You'll never get Rich to change his opinion—he's stubborn as a mule.