The word "unamiable" is usually associated with unpleasantness, lack of amiability, and unfriendliness. The antonyms of "most unamiable" are words that convey the opposite of these negative characteristics. Some examples could be courteous, friendly, amicable, congenial, affable, cordial, genial, pleasant, kind, and sociable. Using any of these antonyms instead of "most unamiable" can change the tone of a sentence from negative to positive. For instance, instead of saying "he was the most unamiable person I've ever met," we could rephrase it to say "he was a very pleasant individual to be around.