the GNU version of the Collaborative International Dictionary of English
n. The state or quality of being indubitable.
The Century Dictionary and Cyclopedia
n. The state or quality of being indubitable.
Word Usage
"Experience had apparently taught Mrs. Barton nothing; she knew but one set of tricks -- if they failed she repeated them: she was guided by the indubitableness of instinct rather than by the more wandering light that is reason."