mulish

From mule +‎ -ish.

• IPA^(key): /ˈmjuːlɪʃ/

• Audio (US):

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mulish (comparative more mulish, superlative most mulish)

1. Characteristic of a mule; stubborn, obstinate, or intractable.
   • 1934 October, George Orwell [pseudonym; Eric Arthur Blair], Burmese Days, New York, N.Y.: Harper & Brothers, Publishers, →OCLC:

     […] a rickety verdigrised geyser which would spit two inches of tepid water into the bath and then mulishly stop working."

• stubborn as a mule
• See also Thesaurus:obstinate