The quality or state of being deceitful; dishonesty or the tendency to trick others.
From deceitful (adjective) plus the noun suffix -ness. Deceitful comes from deceit (from Latin decipere, to catch or ensnare), so deceitfulness is the state of being tricky or untrustworthy.
This noun captures something psychologists study—the degree to which a person naturally leans toward deception rather than honesty, making it useful for describing personality traits.
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