hard(redirected from hard and fast)
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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