How to say "well-informed" in Japanese

• 博識はくしきCommon
  na-adjectiveCovers well-informed in the sense of learned or erudite — a person whose knowledge is broad and extensive, ranging over many subjects. Typical context: praising someone who knows a great deal about almost everything.
• 詳しいくわしいJLPT N3approx.Common
  i-adjectiveCovers well-informed (about): knowing a particular subject or field very well, with detailed, thorough knowledge. Typical context: describing someone who is well-acquainted with a specific area and knows it inside out.
  このあたりはお詳くわしいですか。↗

  Are you familiar with this area?

Use 博識 for well-informed in the sense of learned or erudite — broad, extensive knowledge of many subjects — and 「詳しい」 for well-informed about a particular field, meaning you know that subject very well.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 有識ゆうしきwell-informed
• 博聞はくぶんwell-informed
• 博識はくしきlearned
• 詳しいくわしいknowing very well