Kalos
The adjective καλός means beautiful and encompasses meanings equivalent to English "good", "noble", and "handsome". The form given by convention is the masculine, but it was equally used of women (the feminine form is καλή) and could also describe animals or inanimate objects.
Plato, in his work Republic, used the term τό καλόν (the neutral form) in his attempts to define ideals. However, his protagonist in the dialogue, Socrates, stated that he did not fully comprehend the nature of this καλόν.
Read more about this topic: Kalos Kagathos