toughest

ADJECTIVE

sturdy, strong

Synonyms

STRONGEST

hard healthy resilient solid stiff tenacious tight vigorous

STRONG

firm fit hardy stalwart stout

WEAK

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

Antonyms

STRONGEST

easy flexible loose pliable pliant slack soft weak yielding

WEAK

controllable delicate facile fragile gentle kind nice tender unstable vulnerable wobbly

ADJECTIVE

obstinate, rough

Synonyms

STRONGEST

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

STRONG

adamant firm refractory savage

WEAK

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

Antonyms

STRONGEST

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

STRONG

supple

WEAK

controllable delicate fragile tender unstable vulnerable weak wobbly

ADJECTIVE

difficult, laborious

Synonyms

STRONGEST

arduous demanding hard onerous severe stiff strenuous troublesome

STRONG

handful heavy mean uphill

WEAK

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

Antonyms

STRONGEST

calm easy facile flexible mild nice pliable pliant soft trivial

WEAK

controllable delicate fragile gentle kind tender unstable vulnerable weak wobbly

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Bass, running in the June 2 primary for a second and final term, faces the toughest reelection fight of her political career.

From Los Angeles Times • May 27, 2026

During tests in April, researchers found software issues in MacOS, one of the world’s toughest targets for hackers.

From The Wall Street Journal • May 14, 2026

Sorting AI winners from AI laggards has been one of the toughest calls for investors in 2026.

From Barron's • May 8, 2026

However, some experts have told the BBC the tech isn't a substitute for the powerful data centres needed to run the toughest AI tasks, although they could be useful for less demanding work.

From BBC • May 1, 2026

Still, it wasn’t much to show one of the country’s toughest schools.

From "Geeks: How Two Lost Boys Rode the Internet Out of Idaho" by Jon Katz