feeling of emptiness; sense of void
Describes a psychological or emotional state of hollowness, lack of fulfillment, or meaninglessness.
After quitting my job, I was overcome by a strong feeling of emptiness.
Even after succeeding, he couldn't shake off the sense of void.
Compound of 空虚 (kuukyo, 'emptiness, void') and 感 (kan, 'feeling, sensation').