inextinguishable

/ˌɪnɪkˈstɪŋɡwɪʃəbəl/
adjective
  1. Impossible to put out or stop burning; (figurative) impossible to suppress or end.
    • The campfire burned with an inextinguishable flame despite the rain.
    • Her inextinguishable optimism kept the team going through the hardest times.
    • The child's curiosity was an inextinguishable drive to learn new things.
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