proficient in ( synonym found)
Definition of proficient in:

(adj) : good at; skilled; fluent; practiced, especially in relation to a task or skill
"he was a proficient writer with an interest in human nature."
(n) : an expert
Definition of proficient in:

(adj) : good at; skilled; fluent; practiced, especially in relation to a task or skill
"he was a proficient writer with an interest in human nature."
(n) : an expert
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