Undoubted (adjective)

1. Certain; not to be questioned or disputed.
2. Unquestioned; not doubtful.

Origin:

Late 16th century: from un- "not" + doubted, past participle of doubt.

Examples:

1. The singer's talent was an undoubted fact.
2. His innocence was an undoubted truth.
3. Her success was undoubted, as she had won multiple awards.
4. The value of education is an undoubted truth.
5. His leadership skills were undoubted, making him a great choice for the CEO position.