How to say "adept" in Japanese

• 上手じょうずJLPT N5approx.Common
  na-adjective, nounCovers the plain sense of 'adept': being good at or skilled at something. Neutral and positive, it is the natural choice for praising how well someone does something, whether cooking, a sport, or a language.
  あなたは上手じょうずにバスケットボールができますか。↗

  Do you play basketball well?
• 達者たっしゃJLPT N1approx.Common
  na-adjectiveGlossed 'skilled; adept', with a nuance of seasoned, practiced ability, but seldom the word you want for 'adept': it is best known for 'hale and hearty', describing someone in good health and full of vigor.
  彼女かのじょはフランス語ふらんすごが達者たっしゃだ。↗

  She has a good command of French.

For the everyday sense of 'adept' — good at something — 上手 is the default; 達者 also means adept but is better known for 'hale and hearty', so it is rarely the word you want.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 上手じょうずskillful
• アデプトadept
• 達者たっしゃskilled