Well-informed (adjective)

1. Having a lot of knowledge about a particular subject or many subjects.
2. Having knowledge that is up-to-date and accurate.

Origin:

The word "well-informed" is a compound word, made up of the words "well" and "informed". the word "well" has been used as an adverb meaning "in a good or satisfactory way" since the old english period, and the word "informed" has been used as a verb meaning "to give knowledge or information to" since the late 16th century.

Examples:

1. The well-informed investor was able to make smart decisions in the volatile stock market.
2. I always rely on my well-informed friend for recommendations on the latest books and movies.
3. The well-informed teacher was able to answer all of the students' questions.
4. It's important to be well-informed about current events in order to make informed decisions.
5. The well-informed tour guide was able to provide interesting facts about the historical sites we visited.