1. in a way that sparkles or shines brightly with flashes of light
2. in a way that is impressively attractive or impressive in appearance

Examples

• The diamond ring caught the light glitteringly as she moved her hand.
• The ballroom was decorated glitteringly with gold and silver ornaments.
• Stars shone glitteringly above the dark ocean.
• She wore a glitteringly embellished gown to the gala.
• The frost covered the grass glitteringly in the morning sun.
• The performance was glitteringly executed with perfect precision.