harder Synonyms

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