Inexhaustible
/ˌɪnɪˈɡzɔstəbəl/
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Definition
(adj) Impossible to exhaust; unlimited.
Sentence Examples
Your supply of anecdotes is inexhaustible.
Books are inexhaustible sources of knowledge.
CEFR Practice Quiz
The young children seemed to have an ____ supply of energy, playing all day without resting.