Main Entry: im·pla·ca·ble

Pronunciation: \(ˌ)im-ˈpla-kə-bəl, -ˈplā-\

Function: adjective

Etymology: Middle English, from Latin implacabilis, from in- + placabilis placable

Date: 15th century

: not placable : not capable of being appeased, significantly changed, or mitigated <an implacable enemy>

— im·pla·ca·bil·i·ty \-ˌpla-kə-ˈbi-lə-tē, -ˌplā-\ noun

— im·pla·ca·bly \-ˈpla-kə-blē, -ˈplā-\ adverb