I feel like "cuteness" is "beauty" with an extra tinge of "energy".... as far as the mood that one may feel
Seeing an absurdly beautiful lady pout makes her adorable. And imagining any cute chibi act all wistful gives an atmosphere of melancholic elegance - one that is oddly beautiful on top of it being obviously sad.
Somebody disprove me on this because I can't get it out of my head