12 letters · 17 points in Scrabble
noun an excessive reaction; a reaction with inappropriate emotional behavior
originEtymology tree Proto-Indo-European *úp Proto-Indo-European *-er Proto-Indo-European *upér Proto-Germanic *uber Old English ofer- Middle English over- English over- English reaction English overreaction From over- + reaction.
Etymology from Wiktionary, CC BY-SA 3.0