stubborn as a mule (adjective) hard-nosed: tough and shrewd
Sinonime: bullheaded, hard-boiled, hardheaded,
inflexible, mulish, no-nonsense,
obdurate,
obstinate, pigheaded,
stubborn, stubborn as a mule,
tough, tough-minded,
uncompromising, unsentimental
Antonime: sentimental