depends on context...the root word is "smuk" if you are saying "you are gorgeous" it would be "du er smuk" if you are saying "hey gorgeous" it would be "hey smukke"
izglezhdash razkoshno (изглеждаш разкошно)
"Eres maravilloso" or "Eres espléndido"
You can say "linda" or "maravilhosa".
Anata ga gōjasu da there's no word for gorgeousanata ga bijin da is youre beautiful
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