1. the quality or state of being impossible to doubt; absolute certainty.
Usage: formal; philosophical

Examples

• The indubitability of mathematical truths makes them foundational to science.
• Philosophers have long debated the indubitability of our sensory perceptions.
• She spoke with such conviction that her indubitability was never questioned.
• The indubitability of the evidence left no room for reasonable doubt.
• Descartes sought indubitability as the starting point for his philosophical system.