It means that you were observed driving in a manner that is not prudent or smart. And for the area you were driving in, your speed was believed to be unreasonable at that time.
That would be a moving violation. As such it will show up on your driving record.
indulgent, absurd, extreme, imprudent, unreasonable, costly, exorbitant,
In Wisconsin, if you’re involved in an accident and believe that unreasonable and imprudent speed was a contributing factor, you can gather evidence such as witness statements, photographs of the scene, and police reports. It’s also important to document any traffic violations linked to the other driver’s speed. Consulting with an attorney can help you understand your rights and options for pursuing compensation or challenging any liability claims. Additionally, you can file a complaint with local law enforcement if you believe the speed was excessive and unsafe.
"Prudent" means careful or cautious; "imprudent" means risky or incautious. "Imprudent actions" are risky ones.
in a imprudent manner
Simple, witless, inane, stupid, asinine, silly, senseless, imprudent, unreasonable, irrational, ridiculous, foolhardy, thoughtless, preposterous, absurd, nonsensical
I was imprudent to place myself at such risk.
A synonym for goofy could be a nutball, or a knucklehead.
The imprudent man walked home.
It would be imprudent to ask a personal question during a class.
The word imprudent means being careless or acting unwisely. His imprudent remarks about his boss cost him his job. Building a full-scale model of an untested design would be imprudent.
Uncle Jesse's financial losses are a result of his imprudent investment choices.