Trailing Labour this time last year, the Conservatives are looking unassailable.
From the time.com
In a perfect world, the pro-life argumentation of George Weigel is unassailable.
From the newsweek.com
On grounds of economic efficiency, the case for a bigger gas tax is unassailable.
From the theatlantic.com
In courtrooms and in the popular imagination, it is often seen as unassailable.
From the latimes.com
Any wonder how some athletes feel endowed with a sense of unassailable privilege?
From the timesunion.com
With the CME already a leader in screen trading, it looks all but unassailable.
From the economist.com
There's no question that general manager Brian Sabean's strategy is unassailable.
From the sfgate.com
A few years ago, Google's position as search leader was practically unassailable.
From the washingtonpost.com
Further goals by Jack Toyne and Rhys Vickery gave Highridge an unassailable lead.
From the thisisbristol.co.uk
More examples
Impregnable: immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
Impossible to assail
Without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
(unassailably) unalterably: in an unalterable and unchangeable manner; "his views were unchangeably fixed"
Secure against attack; impregnable; undeniable, incontestable or incontrovertible