Tip: Are you a non-native English speaker? I have just finished creating a 
Web AppOne of the first things non-native English speakers learn is that the adverbial form of “good” is irregular. We don’t say, for example, “he sings very goodly”; we say “he sings very well”. It may come as a surprise, then, that the word “goodly” also exists in English and was quite common in the past (but it does not mean the same as “well”).
“Goodly” is an adjective, not an adverb, and has two different meanings, both of which are rather formal or archaic. The only meaning that is still used today to a certain extent is “quite large in number or quantity”, as in
I know a goodly number of people who disagree with you.
The other meaning of “goodly”, which is almost never used in modern English but can be found in older literature, is “of pleasing or fine appearance”, e.g.
For the sake of completeness, we should mention that “goodly” has a third meaning, “graciously” (in which case it is an adverb), but this meaning is only found in literature so old that the word “goodly” will be of least concern, such as in the following excerpt from The Faerie Queene by Edmund Spenser:
Right glad with him to have increast their crew:
But to Duess’ each one himselfe did paine
All kindnesse and faire courtesie to shew
