sisu

Sisu is a uniquely Finnish concept that describes a special kind of stoic determination, grit, and perseverance in the face of extreme adversity. It is often described as the "Finnish soul," representing the ability to push forward and complete a task even when the odds are stacked against you or when you are physically and mentally exhausted. Unlike mere stubbornness, sisu implies a quiet, calm, and resolute courage. It is not about being loud or aggressive; rather, it is the internal engine that keeps a person going when they would otherwise give up. It is most commonly used to describe individuals who overcome significant hardship through sheer force of will.
In conversation
Discussing a marathon
I really thought you were going to quit at the halfway mark.
I really thought you were going to quit at the halfway mark.
I wanted to, but I just had to find my sisu and keep running.
I wanted to, but I just had to find my sisu and keep running.
Used here to describe internal motivation during physical struggle.
Reflecting on a project
That project was a nightmare, but you finished it on time.
That project was a nightmare, but you finished it on time.
It took a lot of sisu to get through those late nights, but I'm glad it's done.
It took a lot of sisu to get through those late nights, but I'm glad it's done.
Highlights the endurance required for long-term professional challenges.
Examples
She showed great sisu during the storm.
She showed great sisu during the storm.
It takes true sisu to start a business from scratch.
It takes true sisu to start a business from scratch.
His sisu in the face of overwhelming odds inspired the entire community.
His sisu in the face of overwhelming odds inspired the entire community.