• WordNet 3.6
    • adj incognizant (often followed by `of') not aware "seemed unaware of the scrutiny","unaware of the danger they were in","unaware of the newborn hope","the most unaware person I've known"
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Webster's Revised Unabridged Dictionary
    • a Incognizant Not cognizant; failing to apprehended or notice. "Of the several operations themselves, as acts of volition, we are wholly incognizant ."
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Century Dictionary and Cyclopedia
    • incognizant Not cognizant; failing to cognize or apprehend. Also spelled incognisant.
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Chambers's Twentieth Century Dictionary
    • adjs Incognizant not cognisant
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In literature:

They were incognizant of realities.
"Port O' Gold" by Louis John Stellman
Of those around him it was quite clear that he was altogether incognizant.
"Valentine M'Clutchy, The Irish Agent The Works of William Carleton, Volume Two" by William Carleton
It predicates contradiction of two extremes, which are asserted to be equally incomprehensible and incognizable.
"Christianity and Greek Philosophy" by Benjamin Franklin Cocker