The difference between Indubitable and Undoubtable
When used as adjectives, indubitable means clearly true, whereas undoubtable means incapable of being doubted.
Indubitable is also noun with the meaning: that which is indubitable.
check bellow for the other definitions of Indubitable and Undoubtable
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Indubitable as an adjective:
clearly true; providing no possibility of doubt.
Examples:
"The indubitable effect of the potion convinced many nonbelievers."
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Indubitable as a noun:
That which is indubitable.
Examples:
"If we build logically upwards from a few indubitables, the whole system must remain correct."
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Undoubtable as an adjective (rare):
Incapable of being doubted; indubitable.