• (a.) Having lost, or tending to lose, inflections by phonetic decay; as, anaptotic languages.
An`ap·tot'ic adjective [ Greek ... back + ... belonging to case.] Having lost, or tending to lose, inflections by phonetic decay; as, anaptotic languages. 
(of languages) tending to become uninflected, in accordance with a theory that languages evolve from uninflected to inflected and back.