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Related to hard: die hard, Hard boiled eggs
hardadjective 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
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