Added 9 October 2026 overreaction noun Categories: ActionsRare Words noun ! Definition from Wiktionary (CC BY-SA). More about overreaction at Wordnik → Where our words come from → A reaction that is excessive. She had every right to dump you, but cutting up all your clothes after she did so was an overreaction. Related Words: excessiveoverkillreactionresponseexaggerationovershootinghyperreactionoverresponseoverreactivityoverstatementoveractionovercorrection Back to today's word