informed

• (General American) IPA^(key): /ɪnˈfɔɹmd/
• (Received Pronunciation) IPA^(key): /ɪnˈfɔːmd/

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inform +‎ -ed

informed

1. simple past and past participle of inform

informed (comparative more informed, superlative most informed)

1. Instructed; having knowledge of a fact or area of education.

   Synonyms: abreast, apprised, up to date, up-to-date

   An informed young man delivered a lecture on the history of modern art.

2. Based on knowledge; founded on due understanding of a situation.
   • 2009, Diarmaid MacCulloch, A History of Christianity, Penguin, published 2010, page 696:

     Another informed and sobering estimate is that by 1800 indigenous populations in the western hemisphere were a tenth of what they had been three centuries before.

in- +‎ formed the first sense probably uses in- (“in”), the second sense uses in- (“prefix of negation”).

informed (comparative more informed, superlative most informed)

1. (obsolete) Created, given form.
   • 1590, Edmund Spenser, “Book III, Canto VI”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie, →OCLC:

     after Nilus invndation, / Infinite shapes of creatures men do fynd, / Informed in the mud, on which the Sunne hath shynd.

2. (obsolete) Unformed or ill-formed; deformed; shapeless.
   • 1596, Edmund Spenser, An Hymne in Honour of Beautie:

     But, mindfull still of your first countries sight
     , Doe still preserve your first informed grace,
     Whose shadow yet shynes in your beauteous face

3. (astronomy, obsolete) Not included within the figures of any of the ancient constellations.

   the informed stars

• foremind, friendom