The Collaborative International Dictionary of English v.0.48:

Dubiety \Du*bi"e*ty\, n.; pl. Dubieties. [L. dubietas, fr.
   dubius. See Dubious.]
   Doubtfulness; uncertainty; doubt. [R.] --Lamb. "The dubiety
   of his fate." --Sir W. Scott.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dubiety
    n 1: the state of being unsure of something [syn: doubt,
         uncertainty, incertitude, dubiety, doubtfulness,
         dubiousness] [ant: certainty]