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Related to prepensely: unpremeditatedly
Contemplated or arranged in advance; premeditated: malice prepense.
[From Middle English, past participle of purpensen, to premeditate, from Anglo-Norman purpenser : pur-, before (from Latin pro-; see pro-1) + penser, to think (from Latin pēnsāre; see (s)pen- in Indo-European roots).]
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.
in a premeditated way
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014