inexhaustible

adjective

in·​ex·​haust·​ible ˌi-nig-ˈzȯ-stə-bəl 

: not exhaustible: such as

a

: incapable of being used up

inexhaustible riches

b

: incapable of being wearied or worn out

an inexhaustible hiker

inexhaustibility

ˌi-nig-ˌzȯ-stə-ˈbi-lə-tē 

noun

inexhaustibleness

ˌi-nig-ˈzȯ-stə-bəl-nəs 

noun

inexhaustibly

ˌi-nig-ˈzȯ-stə-blē 

adverb

Synonyms

• indefatigable
• tireless
• unflagging
• untiring
• weariless

Examples of inexhaustible in a Sentence

The world's supply of oil is not inexhaustible.

He seems to have inexhaustible energy.

Recent Examples on the Web

She’s also provided a friendly forum for Freedman to counterattack on her SiriusXM show, including by discussing his $250 million defamation suit on behalf of Baldoni against The New York Times, an inexhaustible conservative punching bag. —Gary Baum, The Hollywood Reporter, 24 Jan. 2025

The truth about cruise ships turns out to be what their inexhaustible supply of indulgences reveal about the passenger. —John Roy, Vulture, 14 Jan. 2025

Harnessing it would provide a practically inexhaustible supply of fuel. —Emily Waltz, IEEE Spectrum, 30 Dec. 2024

Be aware of your mortality Ludlow believes the biggest mistake is thinking that time is an inexhaustible resource. —Barnaby Lashbrooke, Forbes, 13 Jan. 2025

Word History

First Known Use

1601, in the meaning defined above

Kids Definition

inexhaustible

adjective

in·​ex·​haust·​ible ˌin-ig-ˈzȯ-stə-bəl 

1

: impossible to use up

an inexhaustible supply

2

: impossible to tire out

an inexhaustible worker

inexhaustibility

-ˌzȯ-stə-ˈbil-ət-ē 

noun

inexhaustibly

-ˈzȯ-stə-blē 

adverb