unassailable

The mayor appointed an experienced arbitrator to mediate between the sides and resolve the transit strike. Anarbiter is one who may or may not have official status but whose opinion or judgment is recognized as being unassailable or binding:

an unassailable lead in the competition

an unassailable position in the market

an unassailable defense strategy

her unassailable confidence in her abilities

an unassailable sense of self-worth

to establish an unassailable position in the industry

If only they could rescue her, but dementors in those numbers would be virtually unassailable.

Current V.A. officials pushed back against suggestions of stifled research, insisting their commitment to science was unassailable.

Scarlett sniffed. Lucky for Ashley that he had an unassailable reputation for courage, or else there'd be trouble.

But then, to the dismay of the Indian supporters, he capitulated, ending Carlsen an unassailable lead and the world crown.

Knowledge and curiosity are unassailable treasures.

As for me, I am undaunted and unassailable.

The exceedingly quiet manner and the unassailable social position of Minister Adams in no way conciliated them.

As the battle over the future of work heats up, Microsoft's position is enviable but not unassailable.

" Oho! They were coming to arrest you! " said Uncle Vernon, with the triumphant air of a man reaching an unassailable conclusion.

On the industrial outskirts of Ho Chi Minh, at a run-down, warehouse-like plant behind an unassailable gate, about 200 young Vietnamese labored.