hard Synonyms

severe difficult tough arduous solid strong harsh toilsome grueling heavy rigid backbreaking unfeeling tricky trying stern unyielding laborious strict heavily punishing thereabout surd toughened swingeing testing taxing tangled taut thereabouts strongly stormily stout stoutly strenuous stressful stringent stringy stubborn sturdily straitened substantial stony thickly thick-skinned tuff turbulently tyrannical unamiable unbending