Sentence examples for existence is doubtful from inspiring English sources

Whether the self-styled Bundesliga-Dino (dinosaur) can soon return to a more comfortable existence is doubtful, while the situation off the pitch remains as fraught with vagaries as Johan Djourou's thought-process.

Although Boleslaus the Brave's notched sword has not been preserved and even its very existence is doubtful, its legend had a great impact on Polish historical memory and the treatment of its successor, the modern Szczerbiec.

Conversely, the existence of RAI is doubtful when baseline (free) cortisol levels are high or when 250 μg ACTH is regarded as a supraphysiologic stimulus [ 5, 18, 24].

More specifically, Kant intends to refute what he calls problematic idealism, according to which the existence of objects outside us in space is "doubtful and indemonstrable" (B274).

It is doubtful whether it ever had any real existence.

If the existence of the BBC, NPR or PBS was really beyond question, it is doubtful that they would do anywhere near as good a job.

This view is doubtful as there are no contemporary evidences to prove the existence of a metropolis in the name of "Nikama" or "Nikam".

That much is doubtful.

Fontana is doubtful.

Bleasdale is doubtful.

That is doubtful.