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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.
by SykoSuzie October 14, 2009
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