once-enthusiastic
definitions
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adjective
Having previously been characterized by great passion, excitement, or eagerness, but no longer possessing those qualities.fr: Autrefois enthousiaste
examples
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His once-enthusiastic scientific ambition had transformed into a profound existential dread, as the consequences of his reckless experimentation became apparent.
Son ambition scientifique autrefois enthousiaste s'était transformée en une profonde angoisse existentielle, à mesure que les conséquences de son expérimentation imprudente devenaient apparentes.