Arduous
Arduous adjective - Requiring considerable physical or mental effort.
Threatening and arduous are semantically related. In some cases you can use "Threatening" instead an adjective "Arduous".
Nearby Word: arduously
Threatening
Threatening adjective - Giving signs of immediate occurrence.
Arduous and threatening are semantically related. Sometimes you can use "Arduous" instead an adjective "Threatening".
Mutual synonyms
Cite this Source
Threatening and Arduous. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/arduous/threatening
Arduous & Threatening. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/arduous/threatening>.
Threatening or Arduous. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/arduous/threatening.
Google Ngram Viewer shows how "arduous" and "threatening" have occurred on timeline