knowledgeful UK /ˈnɒlɪd͡ʒfʊl/US /ˈnɑləd͡ʒf(ə)l/ adjective1 •(rare) Full of knowledge; knowledgeable.[T]he right and responsibility to select the name rests fully upon the father himself, and a knowledgeful man will make the selection in the privacy of his thoughts. — 1960 formsmore knowledgeful · most knowledgeful