Gaudy, Pomp, Splendor, Splendour
な adjective, noun
If something has showy beauty then it's going a little overboard and is going to come across as gaudy. Too much is too much.
かび
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
華美な服装は控えた方がいいんじゃないですか。
Shouldn’t you restrain yourself from wearing gaudy clothing?