taru-adjective, adverb taking the 'to' particle
having fun; rejoicing
Archaic literary word describing a joyful, pleasant state. Used in classical Chinese-influenced writing; not part of modern spoken Japanese.
古典では「怡怡として楽しむ」のように使われる。
In classical texts, it is used like '怡怡として楽しむ' (enjoying oneself cheerfully).