noun
a person or thing that is inexhaustible
adjective
describing something that cannot be used up or tired out
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The scientist's research on renewable energy sources revealed an inexhaustible supply of solar power.
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My grandma's patience seems inexhaustible when dealing with us grandchildren.
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I swear, my dog's energy is just inexhaustible - he never tires out!
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Her creativity seemed inexhaustible, as she continuously came up with new and innovative ideas for the project.