adj. An anagram in which the new word or phrase is the opposite of the original.
The converse of the aptagram is the antigram. In antigrams, a word or phrase gets rejuggled into another word or phrase that bears a meaning opposite to that of the base. Thus, astronomers/moon starers is an aptagram while astonomers/no more stars is an antigram.
Closely associated with anagrams which "reflect" the original meaning are antigrams that "deflect" the original sense. Here are five examples of this contradictory genre.
Antigrams are anagrams that mean the opposite of the original word or phrase when the letters are rearranged. For example: violence — nice, love; evangelist — evil's agent; funeral — real fun.