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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

"It's very expensive to run a war," he said, noting that on a day-to-day basis, the Iran conflict "has to be up there with the costliest interventions the US has undertaken from a financial perspective."

From Barron's • Mar. 19, 2026

That payout, the costliest of the period, stemmed from a March 2021 911 call for Isaias Cervantes, a deaf man who was in the throes of a mental health crisis.

From Los Angeles Times • Feb. 3, 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