General terms:
* Adorableness: This is the most direct translation, but it can sound a bit awkward.
* Charm: This implies a captivating quality that draws people in.
* Sweetness: This suggests innocence and a gentle nature.
* Cutness: This emphasizes the appealing physical appearance.
More specific terms:
* Cuteness: This is similar to "cutness", but emphasizes a childlike or animalistic quality.
* Darling: This suggests a sense of endearment and affection.
* Preciousness: This emphasizes the value and importance of something.
Ultimately, the best noun to use will depend on the specific context.