The quality or state of being too willing to believe things without sufficient evidence; gullibility.
From 'credulous' plus '-ness', forming an abstract noun. This creates a parallel to 'credulity', with Germanic and Latinate ways of naming the same concept.
English lets you express the same idea two ways: 'credulousness' uses Germanic roots and 'credulity' uses Latin roots—it's like having two identical emotional twins from different families!
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