Wiktionary (0.00 / 0 votes) Rate this definition: ignorant (Adjective). Unknowledgeable or uneducated; characterized by ignorance. ignorant (Adjective). Ill-mannered, crude. His manner was at best off-hand, at worst totally ignorant.
1 Megabyte (MB), a measure of amount of information used, for example, to quantify computer memory or storage capacity. 2  Megabit (Mb, or properly: Mbit), a measure of amount of information.  MikroBitti (formerly MB), a Finnish computer magazine.
1 Millions of barrels (Mb, Mbbl or MMbbl), one million barrels of oil. 2  Body wave magnitude (mb), a type of seismic scale. 3  Millibarn, a unit of area used in nuclear physics and particle physics.  Millibel, a hundredth of a decibel.