not easily moved or deceived; practical; shrewd.

obstinate; stubborn; willful.

adjective

yielding

adjective

astute , bullheaded , cool , hang tough , hard , hard-boiled , hard-nosed , headstrong , intractable , level-headed , locked in , mulish , obstinate , pertinacious , perverse , pigheaded , practical , pragmatic , rational , realistic , resolute , sensible , shrewd , sober , stand pat , tough , tough nut , unsentimental , unyielding , willful , dogged , stiff-necked , tenacious , down-to-earth , matter-of-fact , objective , pragmatical , prosaic , tough-minded , unromantic , inflexible , keen , poised , sagacious , stubborn , unbending