per·sev·er·ate

[per-sev-uh-reyt]
verb (used without object), per·sev·er·at·ed, per·sev·er·at·ing.
to repeat something insistently or redundantly: to perseverate in reminding children of their responsibilities.

Origin:
1910–15; back formation from perseveration

per·sev·er·a·tive, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
perseverate

verb
psychology: repeat a response after the cessation of the original stimulus; "The subjects in this study perseverated" 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Perseverate is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
He will ask inappropriate questions and perseverate on certain topics.
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