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The Collaborative International Dictionary
Unadvisedness

Unadvised \Un`ad*vised"\, a.

  1. Not prudent; not discreet; ill advised.
    --Shak.

  2. Done without due consideration; wanton; rash; inconsiderate; as, an unadvised proceeding. [1913 Webster] -- Un`ad*vis"ed*ly, adv. -- Un`ad*vis"ed*ness, n.

Wiktionary
unadvisedness

n. The quality of being inadvisable.