Simple past tense and past participle of exhaust.(verb)
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Use "exhausted" in a sentence
"As she watched, he slumped against the back of the seat, his expression exhausted, but calm."
"This allows them to see the sunrise but also allows them to descend with some light as they will be exhausted from the climb and must very careful on the way down."
"We can start at noon and run til we are all exhausted from the word mines."