hardest harshest sternest cruelest austerest rigidest severest steeliest stoniest strictest toughest firmest roughest grimmest fiercest coolest coldest violentest unkindest meanest dourest gruffest starkest ruggedest unfriendliest seriousest gravest somberest(US) sombrest(UK) stiffest bloodthirstiest viciousest wickedest evillest vilest ghastliest nastiest spitefullest beastliest dastardliest hatefullest wantonest tautest tensest tightest most inflexible most unyielding most inelastic most unbending most compact most solid most hardened most immalleable most impliable most unbendable most unflexible most unmalleable most adamantine coarsest rudest uncouthest crudest bluntest brusquest curtest impolitest vulgarest crassest bluffest foulest lewdest obscenest profanest rockiest pebbliest shingliest craggiest bumpiest jaggedest most gravelly most rockbound most mountainous most lapidarian most stonelike most rock-ribbed More