toughest

hard healthy resilient solid stiff tenacious tight vigorous

firm fit hardy stalwart stout

brawny cohesive conditioned dense durable fibrous flinty hard as nails hard-bitten hardened indigestible inflexible leathery lusty mighty molded resistant rigid robust rugged seasoned sinewy steeled strapping tough as nails unbreakable unyielding withstanding

easy flexible loose pliable pliant slack soft weak yielding

controllable delicate facile fragile gentle kind nice tender unstable vulnerable wobbly

desperate fierce hard hard-nosed harsh narrow resolute severe stern stiff strict terrible

adamant firm refractory savage

arbitrary callous confirmed cruel drastic exacting ferocious fixed hard-bitten hard-boiled hard-line hard-shelled headstrong immutable inflexible intractable merciless obdurate pugnacious ruffianly ruthless stubborn taut unalterable unbending uncompromising uncontrollable unforgiving unmanageable unyielding vicious violent

amenable calm easy easy-going facile flexible gentle kind lenient mild nice peaceful pliable pliant soft tolerant uncertain yielding

supple

controllable delicate fragile tender unstable vulnerable weak wobbly

arduous demanding hard onerous severe stiff strenuous troublesome

handful heavy mean uphill

backbreaking baffling burdensome effortful exacting exhausting exigent grievous hairy intractable intricate irksome knotty labored no piece of cake oppressive perplexing puzzling resisting taxing thorny toilsome trying unyielding weighty wicked

calm easy facile flexible mild nice pliable pliant soft trivial

controllable delicate fragile gentle kind tender unstable vulnerable weak wobbly