Kawaii…cute, pretty, baby-faced, adorable, charming Kirei…beautiful, pretty, classy, well-dressed, neat Utsukushii… naturally beautiful Bijin…noun form of utsukushii

Seeing the kanji always helps : 可愛い　kawaii , something to be loved, (similar to our adorable) 綺麗　Kirei , graceful like a deer or gazelle 美しい　utsukushi : has beauty 美人　: beautiful person So if they are adorable: kawaii If they are lady like and graceful : kirei Utsukushi is used if you want to marry that woman because it’s like the highest form of praise Bijin: a beautiful person, can be also said of heart as well