impacable

From Latin im- (“not”) + pacare (“to quiet”). See pacate.

impacable (comparative more impacable, superlative most impacable)

1. (obsolete) implacable (unable to be appeased)

   Synonym: unpacable

   • 1590, Edmund Spenser, “(please specify the book)”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie, →OCLC:

     But those two other, which beside them stoode,
     Were Britomart and gentle Scudamour;
     Who all the while beheld their wrathfull moode,
     And wondred at their impacable stoure,
     Whose like they never saw till that same houre

• impacability
• impacably

• “impacable”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.