1. Flashing or shining like lightning; brilliant and sudden.
Usage: literary; formal
2. Occurring suddenly and with great intensity; striking or impressive in a sudden way.
Usage: literary; formal

Examples

• The fulgurant flash of the lightning illuminated the entire sky.
• Her fulgurant wit made everyone at the dinner table laugh unexpectedly.
• The fulgurant burst of color in the sunset took our breath away.
• He delivered a fulgurant remark that silenced the room.
• The fulgurant brilliance of the diamond caught the light perfectly.
• A fulgurant moment of inspiration struck the composer as he sat at the piano.