Answer: fluent

AnswerCrossword Clue
FLUENTGlib.
fluentspoken or able to speak with ease
fluentthe variable quantity in calculus
FLUENTWell-versed (in)
FLUENTWell-spoken doc goes after viral malady (6)
FLUENTPolished, languagewise
FLUENTSmooth
FLUENTLinguistically knowledgeable
FLUENTSmooth-talking
FLUENTGlib or graceful
FLUENTSpeaking easily and smoothly.
FLUENTWell-spoken
FLUENTVoluble.
FLUENTAble to speak and write easily.
FLUENTGraceful
FLUENTWell-versed in a language
FLUENTFully conversant
FLUENTArticulate
FLUENTBilingual, e.g.
FLUENTLinguistically gifted
FLUENTSpoken with ease
FLUENTWell-versed