However, depending on the context, you could use prefixes like:
* Am- (meaning "love" or "friend"): Amiable
* Bene- (meaning "good" or "well"): Beneficent
* Phil- (meaning "love"): Philander (though this has a different connotation)
It's important to note that these words don't directly mean "friendly," but rather convey a sense of kindness, affection, or goodwill, which can be associated with friendliness.