na-adjective, noun
full of energy; extremely healthy; in high spirits
Expresses a state of being very energetic, lively, or in excellent spirits. Often used as an exclamation or in set phrases like 元気百倍で頑張る.
朝から元気百倍だ。
I'm full of energy since this morning.
元気百倍で今日も頑張ろう！
Let's do our best today with high spirits!
Compound of 元気 (genki, 'energy, health') and 百倍 (hyakubai, 'hundredfold'). The expression literally means 'energy multiplied by a hundred', emphasizing extreme vitality.