The quality or state of being hesitant; reluctance or unwillingness to act, often due to doubt or uncertainty.
Formed from 'hesitant' plus the suffix -cy, which creates nouns from adjectives. The root traces back to Latin 'haesitare.' This -cy ending was borrowed from French and Latin and remains productive in English for creating abstract nouns.
During the COVID-19 pandemic, 'vaccine hesitancy' became a headline term that made statisticians and epidemiologists realize we needed a precise word for this specific type of uncertainty—language adapts in real time when society needs to discuss a problem clearly. This word is actually younger than you might think in its modern widespread usage.
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