unsearchably
un·search·a·ble
(ŭn-sûr′chə-bəl)adj.
Beyond search or investigation; inscrutable.
un·search′a·bly adv.
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.
unsearchably
(ʌnˈsɜːtʃəblɪ)adv
in an unsearchable manner
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014