Challenging
Challenging adjective - Requiring considerable physical or mental effort.
Startling and challenging are semantically related. In some cases you can use "Startling" instead an adjective "Challenging".
Startling
Startling adjective - Causing a strong emotional reaction because of unexpectedness.
Challenging and startling are semantically related. Sometimes you can use "Challenging" instead an adjective "Startling".
Mutual synonyms
Both words in one sentence
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For the rest of us who don't know about that (and is challenging her for the first time), her face can be quite startling to look at.
Source: Nightmare Face
Cite this Source
Startling and Challenging. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/challenging/startling
Challenging & Startling. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/challenging/startling>.
Startling or Challenging. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/challenging/startling.
Google Ngram Viewer shows how "challenging" and "startling" have occurred on timeline