the front porch and doorway of a house convey ungainsayable class signals
Example sentencesExamples
I got most of the way through, sleepily agreeing, until I was pulled up by such an ungainsayable falsehood that I was forced to go back and revise my opinion of the rest.
My friend, Labour party member, and ungainsayable leftist recommends his ‘friend and favourite vicar-in-training’ in the Guardian.
And then there's the ungainsayable observation (once it's explained) ‘that a bus full of rancorous, quarrelsome, and aggressive passengers is bound sooner or later to have a collision’.
Most of the points that it makes seem to me ungainsayable, but clearly that is not how they strike everyone.