pre·pense 
(pr
ĭ-p
ĕns
)
adj. 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 the Appendix of Indo-European roots).]
pre·pensely adv.