- uncertainty or doubtfulness.
- instability or insecurity: The incertitude of his position in life caused him to postpone marriage.
- uncertainty; doubt
- a state of mental or emotional insecurity
mid-15c., “variability,” from Middle French incertitude (14c.), from Late Latin incertitudinem (nominative incertitudo); see certitude. Incertain “uncertain” and incertainty “uncertainty” also were living words in Middle English.