This is the 4993rd most frequent Japanese word.
絢爛
"絢爛" (Kenran) means "brilliant" or "magnificent," often describing something dazzling or splendid.
Adverbial usage; '絢爛に' indicates how the room was decorated.
絢爛に飾られた部屋は来客を驚かせました。
The room decorated splendidly amazed the visitors.
Adjective usage; '絢爛たる' emphasizes the splendid appearance of the outfit.
彼女の絢爛たる衣装が注目を集めた。
Her dazzling outfit attracted attention.
Noun usage; '絢爛さ' denotes the magnificent nature of the festival.