Adverb of manner

What is Adverb of manner?

"Adverb of manner answer the question how?.”

OR

"Adverb of manner which showing in what manner or how."

Now we can see some examples

Example:

Slowly He walks slowly.
Quickly He finished the work quickly.
Actively She works actively.
Fastly He ran fastly.
Nobly The college student nobly gave up his seat to the pregnant lady.
Proudly He proudly walked on the stage.
Lovingly He speaks with his lover lovingly.
Cowardly Don't speak cowardly.
Hard He worked very hard.
Bravely He fought bravely.
Strongly He built the building very strongly.
Clearly She speaks clearly.
Unwillingly I came to function unwillingly.
Cheerfully I attended the party cheerfully.