hard

hard

adjective arduous, beyond one's reach, burdensome, complex, complicated, convoluted, demanding, difficult, enigmatic, grueling, impassable, incomprehensible, insoluble, insurmountable, involved, involving obstacles, overwhelming, perplexing, problematic, puzzling, vigorous, strenuous, stubborn, troublesome, unachievable, unavailable
Associated concepts: hard and fast law, hard choices, hard lessons learned from law

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See also: callous, close, cohesive, cold-blooded, compact, cruel, difficult, durable, impervious, inflexible, insusceptible, obdurate, onerous, operose, oppressive, ossified, powerful, relentless, rigid, ruthless, severe, solid, strict, stringent, strong, tyrannous, unbending, uncompromising, unrelenting, unyielding