She considered the depths of human gullibility.

A true opportunist is likely to utilize precisely this ambiguity to serve his purpose, capitalizing on human gullibility or ignorance.

Didn't P. T. Barnum, who should know, have something to say about human gullibility?

Mandel believed, with Marx, that "ignorance never helped anybody" except those who profited from its existence ("never underestimate human gullibility, including your own").

SoBig and its variants take advantage of human gullibility.

A study in human gullibility".

The book exposed fraudulent mediums and was described in a review as a "well researched and intriguing case study in human gullibility."

Columnist Simon Hoggart also mentioned it as a "refreshing corrective" to human gullibility.

As proof of human gullibility, the World Wrestling Federation announced the attendance at 19,028; the $1,029,230 gate was the highest one-day arena gross in Boston history.

Trust creates scope for deception, insofar as people assume things that they should not (human gullibility).