acquainted

adjective

1 she was well acquainted with Gothic literature:

familiar, conversant, at home, up to date, up;

well versed in, knowledgeable about, well informed about, cognizant in, apprised of, abreast of, no stranger to;

French au fait, au courant;

informal well up on, in the know about, plugged in to, genned up on, clued in on, wise to, hip to.

▷antonyms unfamiliar; ignorant.

2 I am not personally acquainted with him:

known to;

familiar, friendly, on friendly terms, on good terms, on a sociable footing.

acquaint Oxford Dictionary of English