Ignoramus n. : 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.

Ignoramus n. : A stupid, ignorant person; a vain pretender to knowledge; a dunce.

Example:
Could you recommend a book for english grammar for a complete Ignoramus like me?

Taxonomy
ignoramus, ig, ra, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, glossary, english, language, ESL, Search, Inflected, Etymology, lawyer, Google Search.

Defination from the web:
ignoramus from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Etymology: Ignoramus, ignorant lawyer in Ignoramus (1615), play by George Ruggle, from Latin, literally, we are ignorant of. Date: circa 1616 : ...