自由 じゆう自在 じざい
jiyūjizai

na-Adjective

1. free; unrestricted; (with) complete mastery; completely in control

Yojijukugo
わたくし秘書 ひしょ英語 えうご自由 じゆう自在 じざいだ。
watashino hishowa ēgoga jiyūjizaida
My secretary has a good command of the English language.