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Official:

1. Something utterly ridiculous or lacking sense.
2. Something relating to or resembling an ass.

Slang:

1. The act of being an asshole.
2. The act of being a retard.
3. The act of being stupid.
4. The act of being ignoramus.
Official:

1. That's an asinine plan.
2. That piece of "art" is asinine.

Slang:

That guy's asinine, in all meanings of the word.
Asinine by Jafje September 30, 2007
"Your opinions on that subject are completely asinine."
Asinine by Lindsay December 8, 2003
Completely foolish and stupid.
The war in Iraq is asinine.
asinine by Rand July 10, 2003
Individuals who participate in crossfit
Wow, those crossfitters are asinine for lifting more than they can handle and letting weights fall on their head.
Asinine by Wanderlusty June 6, 2015
1. It literally means "like an ass (donkey)."

2. Stupid and/or stubborn.

3. Belligerent as can be.
1. He was the most asinine person that I have ever met. He wouldn't listen to anyone, and drove drunk and got a DUI and woke up in the drunk tank.

2. I just wanted to slap the crap out of that asinine person!

3. If she was any more annoyingly asinine she would have a tail on her backside.
asinine by IrishDaddy2U April 12, 2010
grading a woman's face low, but her ass-a-nine
I'll give her face a two, but her asinine.
asinine by Travis "Stitch" March 28, 2007