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However, the word "friendly" is not an adverb though it looks so: rather, it is an ADJECTIVE.
eg
- a friendy smile
-Anne is so friendly towards Bob.
-friendly relations
-friendly voice
-She is very friendly & helpful.
It can also be used as a noun, incidentlly.
eg
friendly2 plural friendlies [countable] British English
a game played for pleasure or practice, and not because it is important to win (Longman dictionary)
1. You mean friendliness (noun). Friendlies as a noun can only refer to sport.
2. The word friendly ends in -ly but it is not an adverb. The adverb can be made up for either:
In a friendly way or
warmly, cordially....
Is this sentence correct? 
Re: Is this sentence correct? 
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