The Collaborative International Dictionary of English v.0.48:
hardheaded \hard"head`ed\, hard-headed \hard"-head`ed\, a.
Having sound judgment; sagacious; shrewd; practical and
pragmatic. -- Hard"-head`ed*ness, n.
[1913 Webster]
Moby Thesaurus II by Grady Ward, 1.0:
73 Moby Thesaurus words for "hardheaded":
balking, balky, bigoted, bulldogged, bulletheaded, bullheaded,
case-hardened, dogged, dogmatic, down-to-earth, earthy, fanatic,
hard, hard-boiled, headstrong, hoaxproof, intolerant,
matter-of-fact, mulish, not born yesterday, obstinate, opinionated,
overzealous, persevering, pertinacious, pigheaded, positivistic,
practical, practical-minded, pragmatic, rational, realist,
realistic, reasonable, restive, sane, scientific, scientistic,
secular, self-willed, sensible, set, sober, sober-minded,
sophisticated, sound, sound-thinking, stiff-necked,
straight-thinking, strong-willed, strongheaded, stubborn, sulky,
sullen, tenacious, tough-minded, uncooperative, uncullible,
undeceivable, undeludable, undupable, unfoolable, ungullible,
unhoaxable, unideal, unidealistic, unregenerate, unromantic,
unseduceable, unsentimental, willful, wise, worldly