Implacable :: Implacable (a.) Not placable; not to be appeased; incapable of being pacified; inexorable; as, an implacable prince..
Implacable :: Implacable (a.) Incapable of ebign relieved or assuaged; inextinguishable.
Implacableness :: Implacableness (n.) The quality of being implacable; implacability.
Placability :: Placability (n.) The quality or state of being placable or appeasable; placable disposition.
Placable :: Placable (a.) Capable of being appeased or pacified; ready or willing to be pacified; willing to forgive or condone.