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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
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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
Related Words
sisu Sisuation Sisue SISUH sisung Sisuru
A typically Finnish term, meaning strengh, perseverance and resilience. Could be taken as similar in meaning to the English saying, 'Just do it.'
Sisu is not often used in other countries, but is very important to the Finns, as they feel that it is part of what makes them, them.
Niilo: 'I'm so tired, I just can't finish this marathon!'
Heikki: 'Come on bro! You're a Fin! You've got Sisu, right?'
Niilo: 'I guess so! Finnish pride FTW!'
Sisu by EmilyMoony October 9, 2012
The female version of bruh (Sis is to bro just as sisuh is to bruh)
Wuz up sisuh
SISUH by KJOMATIC September 22, 2018
A Sisue is exactly the same as a normal issue you may have but changes to this term when talking to a real sis

Commonly used when discussing relationship problems
Sis im having a real sisue at the moment, can you help me out?
Sisue by Wilko;) August 21, 2019

Sisuation 

I have a sisuation Brenda!
Sisuation by Dhdhzjcjvj December 4, 2019
Sisuru Is someone who has a beautifull soul .. Also handsome and good looking He is very good at cooking.. love to watch romantic movies..He definitely believes in himself ... he cares about the people he love... he easily get pissed but deep down he is emotional.. he has big ambition and goals.. wich are they definitely win .. If you found a sisuru.. be friends with him.. Because he is a Great and caring friend .. He loves to listen music while doing some work.. Sisuru is good at Maths... Also they can be famous
Look ..! Sisuru is coming.. such a good person ..
I wish I can solve math like sisuru
Sisuru by Gemini guy November 23, 2021