Definition of "mulish" [mul•ish]

• Stubborn and intractable; recalcitrant. See Synonyms at obstinate. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Lady Elizabeth stood her ground, her expression mulish as she met his gaze."
• "A kind of mulish huffiness in his expression made him look ridiculous and unlikeable."
• "Wilkins was "mulish" at times, and he had a reserve."