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Webster 1913 Edition

Noun.

The quality of being cautious.

Noun.

The quality of being cautious; watchfulness; provident care; circumspection; prudence with regard to danger.

cautiousness ‎(usually uncountable, plural cautiousnesses)

The state of being cautious; wariness
- 1853 Daniel Parish Kidder - The Lives of the Popes
  This extreme cautiousness, which was, indeed, the most remarkable feature in his character, still made itself prominent after his elevation.

the state of being cautious