irrepressible
/ˌɪrɪˈprɛsəbəl/
adjective
- 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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