Synonyms for Nimble (same or very similar meaning)
WordNet sense 1 (mentally quick):
agile
WordNet sense 2 (having the capacity for thought and reason especially to a high degree):
intelligent
WordNet sense 3 (moving quickly and lightly):
quick, spry
WordNet sense 4 (characterized by energetic activity):
active
From the ODE community, based on WordNet
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