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Webster 1913 Edition

Noun.

The state or quality of being critical, or of occurring at a critical time.

Accuracy in examination or decision; exactness.

Noun.

The state of being critical; incidence at a particular point of time.

Exactness; accuracy; nicety; minute care in examination.

criticalness ‎(uncountable)

The state or quality of being critical.
- 1965, Michael A. Wallach & Nathan Kogan, Modes of Thinking in Young Children, page 98
  Acquiescence may be roughly described as a "yea-saying" tendency, criticalness as a "nay-saying" tendency.