From Longman Dictionary of Contemporary Englishdoltdolt /dəʊlt $ doʊlt/ noun [countable] old-fashioned STUPID/NOT SENSIBLEa silly or stupid person —doltish adjective
Examples from the Corpus
dolt• Actually, I can, given the stuff that dolts selfishly dump on the streets of my neighborhood.Origin dolt (1500-1600) Perhaps from dold “stupid” ((1400-1500)) 