Meanings of completely fluent in English

My Samsamese was rusty, and it had never been completely fluent.

The upside of my lonely two months was that I became completely fluent in French.

Second, Ellie is completely fluent in the octospider language and can back me up if my translator is either not available or inadequate.

That's not possible in Sweden), but says she can't ever imagine viewing herself as Swedish, or becoming completely fluent in her adopted nation's culture.

He knew little of human languages, but 'Telcam-inevitably-wascompletelyfluent in the one the UNSC used most frequently: English.

Completely fluent, and at ease with the Portuguese lifestyle, Dier set himself the target of making the grade at Sporting.