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2.
When one is sincere and serious at the same time.
"I sinceriously think that it's time for us to sleep together".
by C.J.Superstar July 21, 2011
 
1.
Sincere/Seriously
Being sincere and serious.
I need to get laid sinceriously.
by Francis Craven March 05, 2005
 
3.
The common act of being equally sincere and serious, simultaneously.
I sinceriously hated that bitch in that flick.
by MJH-Dawg February 28, 2008
 
4.
The state of being incredibly sincere and serious at simultaneous intervals within the Space-Time Continuum.
Mom: "Son, we need to talk about your cat's inane behavior in relationship to the proximity of the toaster."

You: "But mom, the cat understand that data does not weight."

Dad: "The Red Army could benefit from such a young, youthful mind in it's ranks!"

Cat: "Sinceriously, I wonder what the fuck is wrong with you people."
by Hnnng Check 'Em June 12, 2011
 
5.
Sincere and seriously smooshed together.
I'm sinceriously sorry about what happend after the break up
by Turboflamas May 29, 2010
 
6.
the merge of seriously and sincere.
i like your sweaty palms. sinceriously, i do.
by jenny h April 13, 2005