The best replacement for proficient is fluent.

The best alternatives to proficient are rated as following:
★★★★★  fluent
★★★★  efficient
★★★★  advanced
★★★  expert
★★★  intermediate
★★  competent
★  experienced
★  conversational
★  skilled
★  excellent
★  proficiency
★  working knowledge
★  familiar
  conversant
  adept
  speakercraft
  proficient in

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