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.
Individuals who participate in crossfit
Wow, those crossfitters are asinine for lifting more than they can handle and letting weights fall on their head.
Nine Asses
Ass to the ninth degree
Ass to the power nine.
Much more Assy than Ass-A-Two
A nine tailed fox is asinine - and so is my boss.
ignorant or overly stupid
resembling an ass
pointless
his suggestion to get some phat boots seemed asinine, considering she had no legs.
The current obsession with celebrity is complete asininity.