tough

tough (Difficult), adjective arduous, bothersome, complex, complicated, convoluted, difficult, enigmatic, entangled, grueling, hard, hard to deal with, hard to manage, hard to understand, impenetrable, insoluble, insurmountable, intractable, involving obstacles, labored, laborious, painstaking, perplexing, problematic, puzzling, troublesome, unachievable, unapproachable

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tough (Durable), adjective built to last, enduring, lasting, long-lasting, reinforced, rugged, solid, sound, stable, steady, strong, sturdy, well-built, well-established, well-made

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tough (Strong), adjective firm, hard, hard to deal with, hard to manage, impenetrable, intractable, obdurate, obstinate, perplexing, resolute, rugged, strenuous, tenacious, too hard, troublesome
Associated concepts: tough laws

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See also: durable, indestructible, indomitable, insusceptible, ossified, pertinacious, rigid, severe, strong, unyielding