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KEY: Youthful.
SYN: Juvenile, young, early, fresh, childish, unripe, puerile, callow, immature, beardless.
ANT: Aged, senile, mature, decrepit, decayed, venerable, antiquated, superannuated.
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KEY: Zeal.
SYN: Ardor, interest energy, eagerness, engagedness, Heartiness, earnestness, fervor, enthusiasm.
ANT: Apathy, indifference, torpor, coldness, carelessness, sluggishness, in cordiality.
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KEY: Zealot.