adjective
playful or frisky in a lively way, like a young horse
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The young actress had a coltish energy on stage that captivated the audience.
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The coltish foal ran around the field playfully, chasing after butterflies.
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She's always been a bit coltish, never wanting to settle down in one place for too long.
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His coltish behavior at the party showed his lack of maturity in social settings.