Incapable of being pacified or placated; unrelenting or unyielding; uncompromising or inflexible.


US English

UK English

Part of Speech



relentless, unyielding, uncompromising, inflexible, obstinate, unchangeable


flexible, compromising, yielding, adaptable, pliable

Word Forms

Part of Speech Words
Noun None
Verb None
Adjective implacable
Adverb None

Example Sentences

  • Despite numerous attempts at reconciliation, their bitter feud continued unresolved due to their implacable hatred for each other.

  • The enemy forces proved to be implacable, launching relentless attacks and showing no mercy to their adversaries.

  • The grieving mother’s pain was so deep and her anger so intense that she became an implacable advocate for justice.

  • The company faced implacable opposition from environmental activists who were determined to stop the construction of the new factory.


The word “implacable” originated from the Latin word “implacabilis,” which means “unforgiving” or “relentless.” It is formed by combining the prefix “im-,” indicating negation or opposition, and the root “placare,” which means “to appease” or “to calm.”

The usage of “implacable” describes a person, attitude, or force that is unyielding, unrelenting, or incapable of being appeased. It implies a firm determination to maintain a particular stance or to continue a certain course of action. The term is often applied to describe strong emotions, unwavering convictions, or unchangeable circumstances.

As an adjective, “implacable” emphasizes the inability to be pacified or mollified. It signifies a steadfast and unmovable nature that does not yield to compromise or negotiation. It can be used to describe unending conflicts, unremitting hostility, or unswerving determination.

Variations of the word “implacable” include “implacably” as an adverb form and “implacability” as a noun form.

Understanding the history and usage of “implacable” reminds us of the existence of deep-rooted conflicts and uncompromising attitudes. It serves as a cautionary reminder that some situations may require alternative approaches or a willingness to seek common ground. Recognizing the implacable nature of certain challenges helps foster empathy, understanding, and creative problem-solving.