the mind > mental capacity > intelligibility > absence of meaning > nonsense, rubbish > unintelligible language, gibberish > [adjective] > given to meaningless repetition
1938 J. Eisenson iii. 47 When the infant reaches the echolalic and voluntary utterance levels, he has reached a developmental stage where rather finely differentiated muscular responses can be made.
1959 S. Sitwell viii. 170 The priest..who with echolalic persistence reiterated the same name over and over again.