harder Synonyms

more unwaveringly more strenuous more laborious more exacting more difficult more demanding more challenging more arduous more solid tougher harsher severer rougher firmer more taxing more trying rigider more unbearable more insufferable more hellish more decisively more resolutely more furious more unflinchingly more substantially more steadily more steadfastly more solidly more securely more rigidly higher durum leveler ironer heavy harsh hardener hard further FASTER dura directer brunt bigger better longer marmoreal more leveller stronger