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

This is probably the least costly option, but also the costliest politically.

From BBC ● Jul. 21, 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

Geological Survey warned the earthquakes had the potential to rank among the deadliest and costliest in the country’s history, projecting a death toll in the tens of thousands and billions of dollars in economic losses.

From The Wall Street Journal ● Jun. 26, 2026

It was reported to be the costliest documentary film of all time, even with production costs undisclosed.

From MarketWatch ● Apr. 30, 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