Relating to or characterized by boiling or the state of bubbling up with intense emotion or energy.
From Latin ebullire (to boil up), composed of e- (out) + bullire (to bubble). The suffix -itive indicates a tendency or relation to the action. The word evolved in medieval Latin medical texts to describe both physical boiling and emotional excitement.
Medieval doctors used 'ebullitive' to explain why people got fevers—they believed bodily humors were literally boiling! This connection between heat and emotion stuck in language even though we now know the science was wrong.
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