Unchallengeable

Your knack for design, whether for The Cherry Tree or The Hatchet, showed your unchallengeable creativity.

The Chinese and Russian efforts in military space make clear that the United States will have to develop an unchallengeable capability to fight and win in space.

In pagan religions, the king was often seen as a kind of god and so was an unchallengeable despot.

In practical terms, that meant that Hadrian was de facto general commander of the Eastern Roman army, something that made his power position as a potential claimant to the throne unchallengeable.

The advent of Protestantism saw something of a return to the idea of a mere unchallengeable despot.

The magister equitum, like the Dictator, had unchallengeable authority in all civil and military affairs, with his decisions only being overturned by the Dictator himself.