incogitant

in·cog·i·tant

 (ĭn-kŏj′ĭ-tənt)
adj.
Thoughtless; inconsiderate.

[Latin incōgitāns, incōgitant- : in-, not; see in-1 + cōgitāns, present participle of cōgitāre, to think; see cogitate.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

incogitant

(ɪnˈkɒdʒɪtənt)
adj
rare thoughtless
[C17: from Latin incōgitāns, from in-1 + cōgitāre to think]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

in•cog•i•tant

(ɪnˈkɒdʒ ɪ tənt)

adj.
thoughtless; inconsiderate.
[1620–30; < Latin incōgitant-, s. of incōgitāns=in- in-3 + cōgitāns, present participle of cōgitāre to think; see cogitate, -ant]
in•cog′i•tant•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Reviewing Edward Neill's, The Secret Life of Thomas Hardy: Retaliatory Fiction (Ashgate, 2004), John Hughes goes straight to the heart of the matter in words that are, in fact, relevant to two or three other recent Hardy publications adopting this "treading on air" style and positing a thesis on pure supposition, incogitant of the subject matter which each critic claims is Thomas Hardy.