carefreeness

Noun

uncountable

The property of being lighthearted, joyous, cheerful, without a care.

Japanese Meaning

無憂無慮 / 気楽さ / のんきさ / 陽気さ

Their carefreeness at the picnic was contagious, turning a simple afternoon into a joyful celebration.

ピクニックでの彼らの無邪気さは周りにも伝わり、ささやかな午後を楽しいお祝いに変えた。

Sense（1）

The property of being lighthearted, joyous, cheerful, without a care.