Fiendish
Fiendish adjective - Of, relating to, or worthy of an evil spirit.
Headstrong and fiendish are semantically related. In some cases you can use "Headstrong" instead an adjective "Fiendish".
Nearby Words: fiend, fiendishly
Headstrong
Headstrong adjective - Given to resisting control or discipline by others.
Fiendish and headstrong are semantically related. Sometimes you can use "Fiendish" instead an adjective "Headstrong".
Cite this Source
Headstrong and Fiendish. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/fiendish/headstrong
Fiendish & Headstrong. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/fiendish/headstrong>.
Headstrong or Fiendish. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/fiendish/headstrong.
Google Ngram Viewer shows how "fiendish" and "headstrong" have occurred on timeline