costliest

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expensive adj.
priceless adj.
harmful, damaging adj.

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.

See Examples For:

costliest

Local enthusiasm for the tournament had fallen away after co-hosts the United States were knocked out by Belgium on July 6, but tickets for the final still became the costliest in US sporting history.

From Barron's ● Jul. 19, 2026

But they are also less disposable than other weapons, among the costliest in Iran’s arsenal to produce.

From The Wall Street Journal ● Jul. 18, 2026

Berlin aims to rationalize burdensome data-protection regulations, freeing small businesses from the costliest strictures.

From The Wall Street Journal ● Jul. 9, 2026

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

From MarketWatch ● May 26, 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