pernicious

adj. causing great harm, or death, or something else real bad.

DAMN that was a pernicious fart.

by Emetic August 28, 2003

pernicious

Describes something that really messes you up. Most of the time you can't tell at the beginning but before you know it, it really fucks you up.

Person 1: It ain't worth it bro, you know Prozac is pernicious. Don't take it.

Person 2: Too late, I can't get off of it now.

Person 1: Damn, I hope you don't get erectile dysfunction like that other kid.

Person 2: Too late for that too...

by Moses D. October 8, 2011

pernicious

Having a harmful effect especially in a stubble or gradual way

The pernicious weed has spread all over the flower bed

by Banditzzi May 26, 2022

pernicious

adj: an all purpose word for something cool, hip, or awesome; or evil, twisted, and sick. Also functions well as a nickname.

Example of cool: Dude, Lord of the Rings: ROTK was SO pernicious!

Example of evil: Our algebra homework last night was PERNICIOUS! I didn't get any sleep!

by Niph April 24, 2004

pernicious

The best type of deed!

Freyalise set up us the bomb; Yawgmoth will pay for his treachery; Freyalise performed her pernicious deed.

by The Ravenclaw Seeker April 27, 2004

Pernicious

Oh yeah, it’s so pernicious! That thing I’m doing to Hym is just so pernicious!

Hym “Yup... That’s how I’d describe it. Pernicious. I don’t know what it means but it sounds bad! What kind of monster would do such a thing!? Do you know? Jordan? Do you know who should do such a thing?”

by Hym Iam October 5, 2022

Pernicious

Extremely harmful or destructive

Not being able to communicate can be pernicious to any relationship.

by _belu.tq March 20, 2023