When you know you are ignorant in a subject, start educating yourself by finding an expert in the field or find a book on the subject.
By 1900 unsafe hospitals and ignorant nurses were things of the past.
For a cultivated man to be ignorant of foreign languages is a great inconvenience.--Anton P.Chekhrv, Russian dramatist
He who thinks himself more blessed because he enjoys benefits, which others do not, is ignorant of true blessedness. ——Benedict de Spinoza
However, Mme. DE Cantel spent only one day with his simple, ignorant peasant family in their tiny home.
Before the October Revolution, the Chinese were not only ignorant of Lenin and Stalin, they did not even know of Marx and Engels
But disreputable, illiterate and ignorant though he was, Fegelein seems to have been possessed of a simon-pure instinct FOR survival
an ignorant ruffianly Gaucho,who.would.fight,steal,and do other naughty things without a qualm(W.H.Hudson.
He is an ignorant and incompetent guy.
heR powers had received no aid from education: she was ignorant and illiterate