As adverbs the difference between fondly and fonly
is that fondly is in a fond manner; affectionately; tenderly while fonly is (obsolete) foolishly.
fondly
English
Adverb
(
en adverb)
In a fond manner; affectionately; tenderly.
Foolishly.
* 1861 , The Living Age
- she fondly believes that ten millions of the free people of the Union will allow her and her seceding brethren to open and shut the portals of this mighty region at their pleasure.