the GNU version of the Collaborative International Dictionary of English
n. The quality or state of being unwary; carelessness; heedlessness.
The Century Dictionary and Cyclopedia
n. The character of being unwary; want of caution; carelessness; heedlessness; recklessness.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the trait of not being cautious and watchful
Word Usage
"Astonished that he had not noticed this before, and shocked at the unwariness by which he might have betrayed her into so dangerous a situation, he became at once reconciled to the idea of leaving her in a convent."