1. ignoramus - Noun
2. ignoramus - Verb
We are ignorant; we ignore; -- being the word formerly written on a bill of indictment by a grand jury when there was not sufficient evidence to warrant them in finding it a true bill. The phrase now used is, "No bill," "No true bill," or "Not found," though in some jurisdictions "Ignored" is still used.
A stupid, ignorant person; a vain pretender to knowledge; a dunce.
Source: Webster's dictionaryI mused upon the ironic fate which had compelled a mathematical genius to make his sole confidant of a philistine lawyer, and induced that lawyer to repeat it confusedly to an ignoramus at twilight on a Scotch hill. John Buchan
He is a dissimulator, a back-pedaler, a coward, and a self-serving ignoramus. In other words, he's a politician. Jerry Coyne
A boor cannot be sin-fearing, an ignoramus cannot be pious, a bashful one cannot learn, a short-tempered person cannot teach, nor does anyone who does much business grow wise. Hillel the Elder
Every smart man is an ignoramus who abuses his ignorance. Cameroon Proverb
The wise knows that he does not know; the ignoramus thinks he knows. Spanish Proverb
The luck of an ignoramus is this: He doesn't know that he doesn't know. Yiddish Proverb