Garish, brilliant showiness.
Back-formation from glitzy, in turn from German glitzern (“glint”). Cognate with Old Norse glitra, glita (“glitter”) and Gothic 𐌲𐌻𐌹𐍄𐌼𐌿𐌽𐌾𐌰𐌽 (glitmunjan, “glisten”).
Practice speaking and memorizing "glitz" and many other words and sentences in English.