noun
youthful impetuosity; youthful vitality
Refers to the rashness, energy, or spiritedness characteristic of youth. Often used in set phrases like 若気の至り (youthful indiscretion).
若気の至りで、無茶な挑戦をしたこともある。
Out of youthful impetuosity, I once took on a reckless challenge.
彼の若気あふれる行動に周りは驚かされた。
Those around him were surprised by his actions brimming with youthful vitality.