Top Definition
Emphatically exhibits the sincerity of your seriousness. The classic use is to close a letter with it.
Dear Urban Dictionary:


Thank you in advance for considering “sinseriously” in your Urban Dictionary.

Were sinseriously to be included in The Urban Dictionary, that would make my day, perhaps even my week.

Sinseriously,
Cyprus Denton Fekks
di Cyprus Denton Fekks 19 febbraio 2010
"sinseriously" is a super fun loving word that can be used to sign a card with. It is a great way to let someone know how much you care about them and that you are serious and sincere about everything you wrote on a letter. It is a cherry on top.
Thanks for being my friend and i hope you enjoy your present

"Sinseriously", Joe
di valkayerie 09 luglio 2011
Being seriously sincere. Sincere & serious about it.
girl: are you serious? guy: Sinseriously !
di Berjmaster 27 novembre 2015
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