2. Showing or arising from a lack of education or knowledge: an ignorant mistake.
3. Unaware or uninformed.
Stupid: 1. Slow to learn or understand; obtuse.
2. Tending to make poor decisions or careless mistakes.
3. Marked by a lack of intelligence or care; foolish or careless: a stupid mistake.
4. Dazed, stunned, or stupefied.
5. Pointless; worthless: a stupid job.
Not everyone who says dumbass things in this world is ignorant. Most people are just stupid.