"surprisingly knowledgeable about what was going on"
knowing a clear and certain mental apprehension ; evidencing the possession of inside information ; characterized by conscious design or purpose; alert and fully informed; highly educated
knowledgeable as in thoroughly acquainted through study or experience
"this girl, so intimate with nature-W.H.Hudson"
"knowledgeable about the technique of painting- Herbert Read"
intimatesomeone to whom private matters are confided ; give to understand; imply as a possibility; marked by close acquaintance, association, or familiarity; concerning things deeply private and personal; having or fostering a warm or friendly and informal atmosphere; having mutual interests or affections; used euphemistically to refer to the genitals; involved in a sexual relationship; innermost or essential; thoroughly acquainted through study or experience
versed thoroughly acquainted through study or experience; an injectable form of benzodiazepine (trade name Versed) useful for sedation and for reducing pain during uncomfortable medical procedures