sinsir 

someone with a ginger muff as hair. Can be wild when angry.

Extreme ginger

one with red hair. Sinsir in welsh. Red baboon

sinsir by Sdeffan May 28, 2006

Sinsir 

A guy who is very popular not very good looking. Great in bed and a very loving person. Also don’t get on his bad side.

If you meat Sinsir you will fall in love

Sinsir by Snarget45 January 21, 2018

sinsible

When a godly sin makes sense

That women's choice was sinsible, she took the money and will let God sort it out

sinsible by emilejfagerstromiv December 11, 2018

sinseriously 

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

sinseriously by Cyprus Denton Fekks February 19, 2010

Sinsur

marked by extreme genuineness or extremely free of dissimulation

Bitch, I will cut you, I'm so sinsur!
or
Damn, that new Atmosphere album is some quality music, so sinsur.

Sinsur by L.R.M. April 18, 2008

Sinsine 

sinsine

is a passionate, motivated and beautiful girl.

she's upbeat, positive, and playful who enjoys living
life to the fullest. she's one of the best person to be around.

Sinsine is so much more than a pretty face

Sinsine by Nostalgiasi November 24, 2021

Sinseriously 

To be sincere and serious at the same time.

"Dude, sinseriously, im sorry"

Sinseriously by LilRayRay August 18, 2008