Officially: An offensive term that deliberately insults somebody's level of intelligence or education.

In slang: A person who is completely ignorant, an ass, a prik, idiot, etc.

A person who is completely ignorant.

1, Word, pejorative term frequently used to describe an ideological opponent who acts like he/she knows more than he/she actually does and/or argues according to obviously misinformed logic.

2, Person who has to google ignoramus to find out what it means.

Someone who doesn't know something that you found out yesterday.

Someone who is ignorant. Often used to describe a bigot.

Latin:
An asshole/idiot/fucktard/stupid ass, etc.

#1 Someone who refuses to answer something important that you NEED to know.

#2 Someone who is an asshole/fucktard/prick/dick etc.