Stiff
Stiff adjective - Going beyond a normal or acceptable limit in degree or amount.
Usage example: don't you think that's a pretty stiff fine for such a minor infraction?
Thick is a synonym for stiff in hard topic. In some cases you can use "Thick" instead an adjective "Stiff", when it comes to topics like semi-solid.
Thick
Thick adjective - Having or being of relatively great depth or extent from one surface to its opposite.
Stiff is a synonym for thick in concentrated topic. Sometimes you can use "Stiff" instead an adjective "Thick", if it concerns topics such as semi-solid.
Both words in one sentence
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Theropod dinosaurs are supposed to have stiff and thick tails that are used for balance and leg powering (sometimes this is a case of Science Marches On however).
Source: Cartoony Tail -
The blade had a thick spine so that it wouldn't flex easily and was often of a hard temper so that it could be both narrow and stiff.
- This is jarring as dinosaurs' tails are long, thick, and in many species stiff.
Source: Inexplicably Tailless
Cite this Source
Thick and Stiff. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/stiff/thick
Stiff & Thick. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/stiff/thick>.
Thick or Stiff. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/stiff/thick.
Google Ngram Viewer shows how "stiff" and "thick" have occurred on timeline