Well-informed

adj.thoughtful, capableprofessional

What it means

Possessing accurate, relevant knowledge from sufficiently broad and reliable sources.

Reach for it when praising a person or decision for understanding the subject before acting

Well-informed residents compared the flood maps with insurance terms before voting.

playful
in the know
when informal awareness of current developments fits
not when The phrase can imply insider gossip rather than reliable knowledge.
everyday
aware
when recognition of an issue is the modest claim
not when Awareness is much weaker than a well-informed grasp of details.
everyday
informed
when access to relevant facts is enough
not when Being informed need not involve broad coverage or reliable source selection.
professional
briefed
when someone received an organized account before acting
not when A briefing can be selective, so briefed does not guarantee independent understanding.
professional
knowledgeable
when developed subject knowledge matters more than current information
not when A knowledgeable person can still be out of date on a recent decision.
professional
up to date
when recency is the critical strength
not when Current information may be shallow or inaccurate despite being recent.
formal
discerning
when evaluating information quality is the person's strength
not when Discernment concerns judgment and does not prove adequate information.
literary
erudite
when scholarly depth deserves elevated praise
not when Erudition may be broad but irrelevant to the immediate facts.

well-informed decision
A well-informed decision considered the long-term costs as well as the headline price.
well-informed public
A well-informed public needs access to methods, limits, and corrections.
keep well-informed
Weekly summaries keep volunteers well-informed without filling every evening with meetings.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.