Proficient

adj.capable, resilientprofessional

What it means

Able to perform a defined skill to a dependable developed standard.

Reach for it when describing demonstrated capability without claiming top-level mastery

After six months of practice, he was proficient in emergency radio procedure.

everyday
practiced
when repeated experience explains smooth performance
not when Practice can produce familiarity without meeting a quality standard.
everyday
skilled
when developed ability can be stated broadly
not when Skilled may imply a higher or less formally assessed level.
warm
capable
when ability to handle the task is the useful claim
not when Capability may be potential rather than proven practice.
professional
accomplished
when substantial achievement demonstrates mature skill
not when The word implies distinction beyond ordinary proficiency.
professional
competent
when someone meets the required standard reliably
not when Competent can mean merely adequate, while proficient suggests developed facility.
professional
fluent
when a language or symbolic system is used smoothly
not when It is too specific for many crafts and does not always imply accuracy.
formal
adept
when ease and quick skill deserve stronger praise
not when It overstates a person who can perform reliably but not fluently.
formal
expert
when authoritative advanced mastery is supported
not when Expert is a much higher claim and should not replace proficient on a resume casually.

proficient in
Mara is proficient in both spreadsheet modeling and plain-language reporting.
technically proficient
The technically proficient editor also knew when a simpler tool was enough.
become proficient
Daily conversation helped the volunteers become proficient in basic signing.

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