irrepressible

/ˌɪrɪˈprɛsəbəl/
adjective
  1. Impossible to control, restrain, or suppress; very lively and energetic.
    • Despite the setbacks, his irrepressible sense of humor never faded.
    • Her irrepressible optimism lifted everyone's spirits.
    • The puppy had an irrepressible urge to chase every squirrel.
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