pro ‧ fi ‧ cient /prəˈfɪʃ ə nt/ BrE AmE adjective
[ Date: 1500-1600 ; Language: Latin ; Origin: present participle of proficere 'to go forward, get something done' ]
able to do something well or skilfully
proficient in/at
Martha’s proficient in Swedish.
There’s only one way to become proficient at anything – practice!
a proficient typist
—proficiently adverb