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

Meanwhile, Terra Drone has partnered with Japanese precision manufacturers to develop components like batteries—the costliest part of a drone.

From The Wall Street Journal ● Sep. 8, 2026

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

From BBC ● Jul. 21, 2026

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

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

From The Wall Street Journal ● Jul. 9, 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