Webster's English Dictionary

Enter the word to look up:

implacable

im.pla.ca.ble \(')im-'plak-*-b*l, -'pla--k*-\ \-ble-\ aj [MF or L; MF, fr. 
   L implacabilis, fr. in- + placabilis placab]le 1: not placable : not 
   capable of being appeased, pacified, or mitigated  2: UNALTERABLE  - 
   im.pla.ca.ble.ness n