- Adding -ly to the end of a noun turns the word into an adjective. The adjectives now have the meaning of "like (the noun), or something that is characteristic of (the noun)".
- If you say "He has manly facial features" you are saying that his facial features are like the facial features that are normal for a man.
- Adding -ly to the end of an adjective turns the word into an adverb. The meaning of the word does not change, or comes from the same idea.
- You can say, "Those are his usual clothes" or "That is how he usually dresses".
- In a few words the meaning may change. These word are often verbs.
- "Likely" does not mean the same thing as "like" at all.