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Synonyms for Facile (same or very similar meaning)

WordNet sense 1 (being or affecting or concerned with a surface; not deep or penetrating emotionally or intellectually):

WordNet sense 2 (requiring or apparently requiring no effort):

WordNet sense 3 (expressing yourself readily, clearly, effectively):
eloquent, fluent, silver, silver-tongued, smooth-spoken

WordNet sense 4 (expressing yourself easily or characterized by clear expressive language):
articulate, articulate

From the ODE community, based on WordNetadd/edit