sisu

/ˈsɪsʉː/

Etymology

Borrowed from Finnish sisu, documented in English since at least 1940.

Why this word is great

SISU — [Noun] The unyielding fortitude of spirit that compels action against impossible odds; not mere endurance, but the defiant activation of latent resolve. Borrowed from Finnish sisu, from sisus ("interior, inside"), implying inner strength or guts. Unlike "resilience" (which bends but rebounds) or "tenacity" (which grips with calculated focus), sisu is the visceral roar of the human engine—raw, uncalculated, and indifferent to spectators. It is the boxer rising on broken ribs to meet the final bell, the student solving theorems by candlelight after the occupation has cut the power, the immigrant learning a fourth language at sixty to read her grandchildren bedtime stories. Sisu is the marrow-deep understanding that surrender is a luxury the body cannot afford.

noun

  1. Strength of will in the face of adversity; grit, perseverance or determination, regarded as an integral part of Finnish culture.“Last week the Finns gave the world a good example of sisu by carrying the war into Russian territory on one front while on another they withstood merciless attacks by a reinforced Russian Army.”