not arguable: Her conclusion is so obvious as to be inarguable.

1870–75; in-3 + arguable

inarguably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To inarguable
Example sentences
Its position is strengthened by two inarguable propositions.
The general principle of conserving biodiversity has inarguable value but
  there's much more debate about how best to do it.
So there it is, in all its inarguable finality: he will never come back.
It is inarguable that the project will create thousands of good jobs for
  construction workers.
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