impacably

from The Collaborative International Dictionary of English v.0.48
Impacable \Im*pa"ca*ble\, a. [L. pref. im- not + pacare to
   quiet. See {Pacate}.]
   Not to be appeased or quieted. [Obs.] --Spenser. --
   {Im*pa"ca*bly}, adv.
   [1913 Webster]
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