No, it is not. It is an adjective, generally the opposite of the adjective friendly.
The word unfriendly is an adjective. It means to not be friendly.
A "Hostile" is a unfriendly person.
The unfriendly store clerk refused to help me find what I was looking for.
The girl was unfriendly so she had no friends
The root word of unfriendly is "friendly."
Unfriendly is spelled as u-n-f-r-i-e-n-d-l-y.
The ISBN of Unfriendly Fire is 0312373481.
Unfriendly Fire has 368 pages.
To behave in a belligerent manor. Act unfriendly and unwelcoming.
Ozone is unfriendly at ground level. It acts as a pollutant.
Unfriendly Fire was created on 2009-03-03.
The word unfriendly has three syllables. (un-friend-ly)