Unknowledgeable or uneducated; characterized by ignorance.
Not knowing (a fact or facts), unaware (of something).
1851, Walt Whitman, “Art and Artists” in Emory Holloway (editor), The Uncollected Poetry and Prose of Walt Whitman, Garden City, NY: Doubleday, Page & Co., 1921, Volume 1, p. 242,
[…] perhaps it is sometimes the case that the greatest artists live and die, the world and themselves alike ignorant what they possess.
(slang) Ill-mannered, crude.
His manner was at best off-hand, at worst totally ignorant.
(obsolete) Unknown; undiscovered
1845, Robert Browning, letter addressed to Elizabeth Barrett Browning, cited in Percy Lubbock, Elizabeth Barrett Browning in Her Letters, London: Smith, Elder & Co., 1906, Chapter 4, p. 106,
[…] as to you, your goodness and understanding will always see to the bottom of involuntary or ignorant faults—always help me to correct them.