Thin
Thin adjective - Lacking excess flesh.
Usage example: you can't be too rich or too thin
Underweight is a synonym for thin in fine topic. In some cases you can use "Underweight" instead an adjective "Thin", when it comes to topics like skinny.
Underweight
Underweight adjective - Having little weight.
Usage example: the long illness left him frail and underweight
Mutual synonyms
Both words in one sentence
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Joshua Christopher is the most obvious example from the series—he's quite thin (even implied to look underweight at one point), has pale blond hair and blue eyes, and looks quite a bit like his sister.
Source: Bishōnen
Cite this Source
Underweight and Thin. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/thin/underweight
Thin & Underweight. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/thin/underweight>.
Underweight or Thin. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/thin/underweight.
Google Ngram Viewer shows how "thin" and "underweight" have occurred on timeline