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unanticipated reaction

/ˌʌn.æn.tɪˈpeɪʃ.tɪd riˈæk.ʃən/ · un.an.ti.pec.ted.re.a.c.tion
noun
  1. An unexpected response or outcome, often resulting from a particular action or event. The unanticipated reaction to the new policy was a surge in public protests.
noun
  1. A response or outcome that is not in line with what was anticipated or expected. The unanticipated reaction to the medication was a severe allergic reaction.
noun
  1. A situation or event that arises unexpectedly and is not in line with the original plan or expectation. The unanticipated reaction to the weather forecast was a sudden change in the storm's trajectory.
Did you know? The term 'unanticipated reaction' is often used in scientific research to describe the unexpected results of an experiment, highlighting the importance of considering all possible outcomes when conducting research.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 29, 2026