ugly

醜い(みにくい)	Literally ‘hard to look at’... physically ugly.

醜悪(しゅうあく)	Hideous – more formal and more extreme than just みにくい. Also – unlike みにくい it’s more often used figuratively to mean ‘scandalous’: An ugly divorce, a scandalous rift between political factions.

気色悪い(きしょくわるい)	Ugly PLUS weird or uncanny: A slug. Also has the nuance of being contemptible BECAUSE ugly.

おぞましい	Grisly or horrible crime or atrocity.