vacilloria
noun
A profound sense of emptiness in one's heart that seems to arise without any clear cause, leaving you questioning the completeness of your life despite everything appearing normal on the surface.
From Latin 'vacillare' (to sway, wander) + 'gloria' (glory), reflecting a state of wandering glory, or a bright yet uncertain emptiness. Pronounced "vass-ih-LOHR-ee-uh"