Gruff
Gruff adjective - Harsh and threatening in manner or appearance.
Usage example: I didn't exchange one word with the gruff mountaineer who sat next to me in the diner
Implacable and gruff are semantically related. In some cases you can use "Implacable" instead an adjective "Gruff".
Nearby Word: gruffly
Implacable
Implacable adjective - Sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion.
Gruff and implacable are semantically related. Sometimes you can use "Gruff" instead an adjective "Implacable".
Nearby Words: implacability, implacably
Cite this Source
Implacable and Gruff. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/gruff/implacable
Gruff & Implacable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/gruff/implacable>.
Implacable or Gruff. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/gruff/implacable.
Google Ngram Viewer shows how "gruff" and "implacable" have occurred on timeline