"fluent" in the adjective sense
1. fluent, fluid, liquid, smooth
smooth and unconstrained in movement
"a long, smooth stride"
"the fluid motion of a cat"
"the liquid grace of a ballerina"
2. eloquent, facile, fluent, silver, silver-tongued, smooth-spoken
expressing yourself readily, clearly, effectively
"able to dazzle with his facile tongue"
"silver speech"
Source: WordNet® (An amazing lexical database of English)
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