perfidious 

deceitful, treacherous, faithless, tending to betray

Billy is a very perfidious boyfriend.

perfidious by cumtome December 18, 2008

pernicious

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

DAMN that was a pernicious fart.

pernicious by Emetic August 28, 2003

persidious

adj.

A play on the words "perfidy" and "insidious". It pertains to an act of treachery that is masked by a seemingly strong sense of justice or righteousness.

Persida Acosta's crusade against Dengvaxia is PERSIDIOUS ambulance chasing.

persidious by alt_DOH September 26, 2019

Pernicious Love 

Having love for somebody that causes harm towards you, knowing full well it’s bad for you. You want to stop, but you always come back.

“I don’t understand how she keeps coming back to that monster!”

“She’s feeling pernicious love.”

Pernicious Love by Luca Simpson January 11, 2019

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...

pernicious by Moses D. October 8, 2011

Peridious 

A God in the Motion Graphics and Arts field: Peridious feels like a fast paced thrill ride with twists and turns of raveshing fufillment. A Master of all types of gaming including console and computer.

The one and only Peridious.

Peridious by Matt Luckey October 14, 2006

pernicious

Having a harmful effect especially in a stubble or gradual way

The pernicious weed has spread all over the flower bed

pernicious by Banditzzi May 26, 2022