Prettiness.
Prettily.
Moderately; somewhat.
Characterized by delicate beauty; dainty; pleasing; sweet.
" Come here, pretty Wabose. – Two Indian Children of Long Ago by Frances Taylor
Yes, that's pretty light. – The Varmint by Owen Johnson F. R. Gruger
They do look pretty, don't they? – The Life of Nancy by Sarah Orne Jewett