Implacable and Invertebrate

Implacable

Implacable adjective - Showing no signs of slackening or yielding in one's purpose.
Usage example: an implacable dedication to the proposition that everyone is entitled to a quality education

Invertebrate is an antonym for implacable.

Nearby Words: implacability, implacably

Invertebrate

Invertebrate adjective - Lacking strength of will or character.

Implacable is an antonym for invertebrate.
Cite this Source
Invertebrate and Implacable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/implacable/invertebrate
Implacable & Invertebrate. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/implacable/invertebrate>.
Invertebrate or Implacable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/implacable/invertebrate.
Google Ngram Viewer shows how "implacable" and "invertebrate" have occurred on timeline