the mind > mental capacity > intelligibility > absence of meaning > nonsense, rubbish > unintelligible language, gibberish > [adjective] > given to meaningless repetition
gabbling1566
lip-laborious1630
lip-working1642
echolalian1927
echolaliac1931
echolalic1938
1931 E. WilsonAxel's Castle vii. 252 Most of us balk at her soporific rigmaroles, her echolaliac incantations.