When I wrote a post just now I came across a interesting problem. I tried to use "widespreadly" as the adverbial form of "widespread", but it was suggested a wrong word on my computer. I consulted a dictionary and couldn't find the word "widespreadly".
It seems quite normal to me to add -ly at the end of the adjective word "widespread" to make an adverbial word. Why is "widespeadly" not an established English word?