Indubitable (adjective)

1. Not doubtful or not questionable. .
2. Absolutely certain or beyond doubt.

Origin:

This word is derived from the latin word "indubitabilis" which is formed by the combination of the prefix "in-" meaning "not" and the word "dubitabilis" meaning "doubtful" or "questionable".

Examples:

1. The evidence provided was indubitable and proved the defendant's guilt.
2. The facts presented were indubitable and left no room for doubt.
3. The success of the project was an indubitable fact.
4. His reputation for honesty is indubitable.
5. The truth of the matter was indubitable and no one could deny it.