Sentence:  The content of his words may lapse back into monotonous repetition , as if a phonograph needle were stuck in one groove ; only seldom is it so <WSD>simple</WSD> as to be a matter of his obviously parroting some timeworn axiom , common to our culture , which he has evidently heard , over and over , from a parent until he experiences it as part of him . 
Meaning of the word marked with <WSD> tags:  lacking mental capacity and subtlety