Full of frolic; playful, merry, and enjoying lighthearted amusement or fun.
Compound of 'frolic' + '-ful' (suffix meaning full of). This adjective formation follows standard English morphology to create an adjective meaning 'characterized by frolic.'
Most '-ful' adjectives are common (joyful, beautiful, careful), but 'frolicful' is rare, suggesting that by the time English was standardizing its vocabulary, people preferred other words like 'playful' or 'gay' for this concept.
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