- The definition of indubitable is something that is true without question or that is absolutely true beyond doubt.
An example of something that would be described as indubitable is the fact that the world is round.
Origin of indubitableClassical Latin indubitabilis: see in- and amp; dubitable
(comparative more indubitable, superlative most indubitable)
- That which is indubitable.
- If we build logically upwards from a few indubitables, the whole system must remain correct.