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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.

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

From BBC • Apr. 1, 2026

Tesla was already set to make 2026 its costliest year on record — by far.

From MarketWatch • Mar. 16, 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

Natural disasters in North America caused the costliest damage, with overall losses at $133 billion, and insured losses $93 billion, according to the report.

From The Wall Street Journal • Jan. 13, 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