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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
tough(Durable), adjective built to last, enduring, lasting, long-lasting, reinforced, rugged, solid, sound, stable, steady, strong, sturdy, well-built, well-established, well-made
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
See also: durable, indestructible, indomitable, insusceptible, ossified, pertinacious, rigid, severe, strong, unyielding