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

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

From MarketWatch ● May 26, 2026

Hurricanes still drive high premiums: 46 of the 50 costliest counties nationwide, mostly strung along the Gulf Coast, count hurricanes as their primary threat, according to the Journal’s analysis of data from price-comparison firm Insurify.

From The Wall Street Journal ● Apr. 29, 2026

America’s costliest autism therapy provider will shut down in May, after Indiana banned the firm from billing Medicaid.

From The Wall Street Journal ● Apr. 3, 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

I figure it’s probably the costliest portable item in the entire Clearview Inn, so I hesitate to leave it in my room for the nine or so hours while I’m away at work.

From "Nickel and Dimed: On (Not) Getting By in America" by Barbara Ehrenreich