This sweeping and quite unsubstantiated assertion is but one man's opinion and has no more weight than another's, for example, my own which is completely contrary.

You just ignore factual evidence that disproves your unsubstantiated assertions.

On the Internet unsubstantiated assertions are as easily published as well-researched articles.

There's more than the usual number of unsubstantiated assertions floating around on this news thread.

There have been unsubstantiated assertions for years about sightings of Americans in Laos or Vietnam.

Other arguments in this volume are no more than unsubstantiated - indeed, highly dubious - assertions.

Sadly it's still just another unsubstantiated assertion from a news reporter at this point.

'I have little faith in the unsubstantiated assertions of psychologists,' Briant said dryly.

Fully imagined moments leap to life; unsubstantiated assertions look ridiculous.

Though it is now conventional wisdom that the ads worked, the evidence for this consists entirely of unsubstantiated assertions by the people who made the ads.