Sisu
Sisu is a Finnish term meaning, roughly, inner strength, determination, perseverance in the face of adversity, and a strong work ethic. Some consider it an appropriate invention for a cold northern country, fractured by thousands of lakes, and long under threat of being overwhelmed, linguistically and otherwise, by more powerful neighbours.
Sisu is also several brand names in Finland, there are both Sisu trucks and Sisu candy. Sisu is used to describe a person with great stamina. Example: Even after cutting his hand open and getting 12 stitches, he did not cry a tear. Wow! He's got sisu!
Spunk, drive, stubborn will, strong, etc.
