Synonyms of informed in English:

knowledgeable, enlightened, illuminated, literate, well informed, well educated, educated, schooled, instructed

sophisticated, cultured

well briefed, well versed, abreast of the facts, primed, up to date, up to speed, in the picture, in the know

au courant, au fait

informal clued up, genned up, filled in, plugged in

British informal switched-on, sussed

US informal down