In a frolicsome or playful manner; in a way that shows lighthearted enjoyment or merriment.
Adverbial form created from 'frolick' (adjective) or 'frolic' (noun/verb) + '-ly' suffix. This follows the standard pattern for forming adverbs in English.
The '-ly' adverb suffix is so productive in English that you can pile it onto almost any root—'frolickly' sounds natural even though it's rarely used, beaten out by the more common 'frolicfully' or 'playfully.'
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