Rattle
Rattle verb - To throw into a state of self-conscious distress.
Usage example: don't let a little mistake rattle you while you're playing during the piano recital
Upset is a synonym for rattle in calm topic. In some cases you can use "Upset" instead a verb "Rattle", when it comes to topics like fluster, unnerve.
Mutual synonyms
Cite this Source
Upset and Rattle. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/rattle/upset
Rattle & Upset. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/rattle/upset>.
Upset or Rattle. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/rattle/upset.
Google Ngram Viewer shows how "rattle" and "upset" have occurred on timeline