I. adverb
Etymology: Middle English sweteliche, swetely, from swete sweet + -liche -ly -ly (adverb suffix)
1. : agreeably , comfortably , pleasantly
has a sweetly simple logic at first glance — Stuart Chase
so golden and sweetly hot it was — John Galsworthy
2.
a. archaic : in a courteous or kindly manner : graciously
b. : in an affectionate or loving manner
spoke sweetly to him
3. : with sweetness : in a manner sweet to the senses
churches whose bells pealed so sweetly — Lamp
4. : charmingly
she was indeed sweetly fair — George Meredith
5. : finely , greatly — used as an intensive
will have to pay sweetly for it
6. : in an easy manner : smoothly
the rope running sweetly between us — Wynford Vaughan-Thomas
the paper was coming off sweetly now — Edna Ferber
II. adjective
Etymology: sweet + -ly (adjective suffix)
archaic : sweet
flowers which smelt so sweetly — Thomas Hardy