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Use "undoubtful" in a sentence
"It is our deliberate judgment that no first volume by any author has ever been published in America showing more undoubtful symptoms of genuine poetic power than this."
"Then suddenly she had opened her eyes, and after remembering, as she always did when she woke, that she was going to have a child, she had looked out of her wide window into the mature and undoubtful sunshine of a fine afternoon."
"His friends still wrought reprieves for him; and, indeed, his fact, till now in the government of Lord Angelo, came not to an undoubtful proof."