What does implacable mean?
Implacable is a formal adjective describing someone or something that cannot be appeased, persuaded, or made to change course. It often characterizes an opponent, rivalry, hostility, or resistance that persists despite negotiation, apology, or concession. The word carries a strongly negative and uncompromising connotation, suggesting not merely difficulty but a refusal to yield. For example, an implacable opponent continues to resist despite repeated attempts at compromise, while implacable hostility remains intense regardless of circumstances. Its force comes partly from its Latin ancestry: the word literally means unable to be placated, with placate meaning to calm or appease. Although it is sometimes used loosely to mean harsh or relentless, its precise focus is the impossibility of reconciliation or change. Implacable is therefore especially useful when describing conflicts, divisions, and resistance that seem incapable of being softened.
adjectiveUnable to be appeased, softened, or persuaded to change course; relentlessly hostile or unyielding. It can also describe an opposition, hostility, or resistance that cannot be easily overcome.
- Impossible to appease, reconcile, or persuade to change course.
- Relentlessly hostile, resistant, or difficult to overcome.
"Despite repeated negotiations, the two sides remained locked in implacable opposition."
"Her refusal to compromise made her an implacable opponent of the proposed reform."
"The project faced implacable opposition from residents who feared the loss of their farmland."
Implacable literally means unable to be placated: it describes an attitude or opposition that cannot be softened by apology, negotiation, or concession.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does implacable come from?
Implacable comes from Latin implacabilis, meaning unable to be placated or satisfied. It was formed from the prefix in-, meaning not or unable, and placare, meaning to appease or please. English borrowed the word in the early modern period, and related English forms such as placable and placate preserve the same Latin root; placid and plead also have deeper connections with Latin placere.
Related word forms
How implacable is actually used
Generally formal and often strongly emphatic. It is particularly common in journalism, political language, and literary descriptions of rivalry, hostility, or resistance; it is less suitable for neutral or casual description.
Easily confused with implacable
Implacable means impossible to appease or relentless in opposition, whereas impeachable means deserving of blame or criticism.