well-informed russian

• подкова́ться

  to get well-versed, to become knowledgeable, to be informed, to be well-prepared

  to get shod (of a horse)

• знавающий

  knowing, knowledgeable, well-informed, expert

• наслы́шавшийся

  having heard a lot, having heard enough, well-informed (by hearsay)

• подкова́вшийся

  well-prepared, well-informed, knowledgeable, experienced

• проша́ренный

  well-informed, savvy

  street-smart, clued-up

Examples

• Том на удивле́ние хорошо информирован.

  Tom is amazingly well informed.