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costliest

ADJECTIVE

expensive

Synonyms

STRONGEST

pricey valuable

WEAK

an arm and leg cher dear excessive executive exorbitant extortionate extravagant fancy high high-priced highly priced inordinate precious premium steep stiff top

Antonyms

WEAK

aiding cheap helpful inexpensive not valuable poor reasonable

ADJECTIVE

priceless

Synonyms

STRONGEST

valuable

WEAK

gorgeous inestimable invaluable lavish luxurious opulent precious rich splendid sumptuous

Antonyms

WEAK

aiding cheap helpful inexpensive not valuable poor reasonable

ADJECTIVE

harmful, damaging

Synonyms

STRONGEST

catastrophic disastrous ruinous

WEAK

deleterious loss-making sacrificial

Antonyms

WEAK

aiding cheap helpful inexpensive not valuable poor reasonable

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.

Burns: It is one of the costliest mistakes investors make.

From MarketWatch • May 26, 2026

Later in the year, Jaguar Land Rover was attacked, in what became the costliest cyber event in UK history.

From BBC • Apr. 1, 2026

Of the eight costliest settlements involving the county, six involved the Sheriff’s Department.

From Los Angeles Times • Feb. 3, 2026

"The first half of the year was the costliest loss period the insurance industry has ever experienced," he said -- but the second half saw the lowest losses in a decade.

From Barron's • Jan. 13, 2026

He called Burnham a “colossal merchandiser” fixated on building the biggest, tallest, costliest structures.

From "The Devil in the White City" by Erik Larson