Fluent

adj.capable, kindprofessional

Meaning 1

Able to communicate in a language smoothly and readily.

Reach for it when describing confident command of spoken, signed, or written language

A fluent interpreter made sure each patient could ask follow-up questions.

everyday
conversational
everyday exchange is possible despite gaps
not when Conversational usually indicates a lower command than fluent.
professional
articulate
ideas are expressed clearly and precisely
not when An articulate person is not necessarily fluent in a second language.
professional
bilingual
competence in two languages is the important fact
not when Bilingual identifies range, not the level of fluency in either language.
professional
proficient
tested competence matters more than natural flow
not when Proficient may describe strong ability without conversational ease.

Performed with an easy, continuous command of the skill.

Reach for it when praising expression or movement that proceeds without awkward interruption

Her fluent demonstration made the complex weaving pattern look natural.

everyday
smooth
the performance has no obvious jolts or hesitation
not when Smooth can praise surface polish without deep command.
warm
effortless
the result appears natural and unstrained
not when It can erase the practice behind the performance and may be unfair praise.
formal
accomplished
long-developed skill deserves recognition
not when Accomplished implies high achievement, not specifically easy flow.
literary
fluid
movement or expression changes continuously and gracefully
not when Fluid is more visual and less suited to certifying a skill.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.