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a uniquely Finnish quality;
the word used to typify the Finnish spirit;
a concept that is at the heart of how all Finns view themselves;
a certain feature or value considered by Finns to be typically Finnish

- endurance, resilience, tenacity, determination, perseverance

- an inner reserve of diligence, capacity, the ability to face head-on and always overcome

- craziness: the recklessness that inspires a person to take on something in the face of incredible odds

- bravery, empowerment, inner strength
Gritting your teeth, continuing to fight against an overwhelming enemy, clearing a forest with your bare hands, continuing on to win a race even after falling.

Sisu means that you finish what you start, you don’t quit in the middle of a job, and you don’t whine.

"It doesn’t take sisu to go to the North Pole; it takes sisu to stand at the door when the bear is on the other side."
sisu by Martha's_Cellmate November 11, 2004
Related Words
SISUH sish sinuhe sishir sisu Sibuhatullah Sisheng sishjas sishlow sasuhina
Sisha is a tyoe of girl who cares and helps for people. She someone time pretends nothing is going on when there is something going on. She hides behind fake smiles. She is beautiful and outgoing. Good grades and would basically stand up for anyone.
Teacher: Sisha just helped that kid over there with autism so she deserves a reward.
Sishi is an outgoing girl who is always smiling. She will give you presents randomly and call you extremely high-regarding titles such as your majesty, my Queen, etc. She is engaged to be married and likes to take photographs..sometimes of her food. She is fun.
I just got a plastic flower for Valentine's Day from Sishi....so typical.
sishi by natalyeah April 12, 2015
Finnish principle of high power of will which should make you to achieve anything. Characteristics: Determination, courage, persistence (etc.)
In Finland we have three things called sisu, sauna and Sibelius and that's what we are.
sisu by Esko Pasko May 16, 2004

sisthren 

refering to a female in a positive manner.
mainly used by rasta
sisthren by KennyG January 11, 2008
the sucking sound with your tongue against the roof of your mouth, that is the sound of exasperation.
sish by honeylick May 18, 2004