Sinthusiasm 

Having much enthusiasm for doing something bad or wrong.

The little boy showed much sinthusiasm when drawing on the wall.

The criminal felt sinthusiasm over his latest caper.

Sinthusiasm by SykoSuzie October 12, 2009

Sinthusiastic 

Feeling excitedly enthusiastic when contemplating or doing something illegal, immoral or unethical.

She's sinthusiastic to pirate her favorite band's new CD.

After seeing the "No skateboarding" sign, he was extremely sinthusiastic to skate Walmart's parking lot.

When she saw the new guy in school, she felt sinthusiastic to date him.

Sinthusiastic by SykoSuzie October 14, 2009

Sarthusiasm 

A condensed version of being sarcastically enthusiastic.

Son: Dad look at my project!
Father: *sarcasm*Oh Wow!!!! That is incredible!!

Son: Wow Dad, thanks for the sarthusiasm

Sarthusiasm by Supermrgolf November 25, 2013