costly

adjective

cost·​ly ˈkȯs(t)-lē 

costlier; costliest

1

a

: commanding a high price especially because of intrinsic worth

costly gems

b

: rich, splendid

2

: made or done at heavy expense or sacrifice

a costly mistake

costliness noun

Synonyms

• big-ticket
• dear
• expensive
• extravagant
• high
• high-end
• high-ticket
• precious
• premium
• priceless
• pricey
• pricy
• spendy [chiefly Northwest]
• ultraexpensive
• valuable

Examples of costly in a Sentence

We use less costly materials in our products.

It was too costly to fix her car after the accident, so she decided to buy a new car instead.

They won the game, but their best player was injured, so it was a costly victory.

The decision to wait could be a costly mistake.

Recent Examples on the Web

Repeated treatments are necessary to maintain the results, which can be costly and increase the risk of complications over time. —Carlos Wolf, Miami Herald, 11 May 2024

The costliest public improvement is a $2.4 million reconstruction of West Mineral and West Walker streets between South Ninth and South 11th streets. —Tom Daykin, Journal Sentinel, 10 May 2024

Word History

First Known Use

14th century, in the meaning defined at sense 1a

Kids Definition

costly

adjective

cost·​ly ˈkȯs(t)-lē 

costlier; costliest

1

: of great cost or value

costly furs

2

: gained at great expense or sacrifice

a costly victory

costliness noun