Etymology

sure

S1U1R1E1

Today it means: Physically secure and certain, non-failing, reliable. Full definition →

Middle English sure ← Middle French sur ← Old French seür
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The story

  1. Latin · derived fromsēcūrus“secure”
  2. Old French · derived fromseür
  3. Middle French · derived fromsur
  4. Middle English · inherited fromsure
  5. English todaysure

From Middle English sure, seur, sur, from Middle French sur or Old French seür, from Latin sēcūrus (“secure”, literally “carefree”), from sē- (“apart”) + cūra (“care”) (compare Old English orsorg (“carefree”), from or- (“without”) + sorg (“care”)). See cure. Doublet of secure and the now obsolete or dialectal sicker (“certain, safe”). Displaced native Middle English wis, iwis (“certain, sure”) (from Old English ġewis, ġewiss (“certain, sure”)), as well as Middle English siker (“sure, secure”) (from Old English sicor (“secure, sure”)) with which it was cognate.

Words from the same roots

Latinsēcūrus all →

securitysecuresicker

Etymology from Wiktionary, CC BY-SA 4.0.