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

Example sentences

  • The implacable opposition of the environmental group prevented the construction of the dam.
  • The implacable dictator refused to listen to any demands for political reform.
  • The implacable winter weather made it impossible to continue the journey.


The word “implacable” is used to describe a person, force, or situation that is unrelenting, unyielding, or uncompromising. It is often used to describe an opponent or adversary that is determined and resolute in their stance and unwilling to change or compromise. The word is also used to describe a force of nature or a situation that is unchangeable or inflexible. In the context of a person, “implacable” is used to describe someone who is determined, obstinate, and unyielding in their beliefs or actions, and who refuses to be swayed or influenced by others