Friendly and In a friendly manner
Incorrect : He talked with us friendly.
Correct : He talked with us in a friendly manner.
Note: Friendly is not an adverb. (The formula of an adverb of manner is adjective + ly. For example, slowly, quickly, nicely, badly and so on). Friendly (noun + ly) is an adjective. You can say:
I have friendly relations with them.
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