extorsively

from The Collaborative International Dictionary of English v.0.48

Extorsive \Ex*tor"sive\, a. [See {Extort}.]
   Serving or tending to extort. [R.] --Johnson. --
   {Ex*tor"sive*ly}, adv. [R.]
   [1913 Webster]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

EXTORSIVELY. A technical word used in indictments for extortion. In North 
Carolina, it seems, the crime of extortion may be charged without using this 
word. 1 Hayw. R. 406.

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