What this suffix does
-placed evaluates how well positioned something is: well-placed, ill-placed. Also figurative: "well-placed sources" = sources with good access to information.

Suffix · forms adjectives
Judges how well something is positioned: well-placed (in the right spot) versus ill-placed (poorly positioned).
Written by Bryan López, English teacher · Updated
-placed evaluates how well positioned something is: well-placed, ill-placed. Also figurative: "well-placed sources" = sources with good access to information.
Adverb + placed.
This is not a productive rule you can apply freely: it is a closed set of fixed expressions. Learn them one by one as set phrases.
-placed
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"Well-placed" always implies a purpose against which the placement can be judged. A well-placed ally is one in a position that gives useful access or influence; a well-placed remark is one that occurs at the right point in a conversation to have maximum effect; a well-placed window is one that captures the light at the right angle. The "well" is always relative to the purpose of the placement.
"Ill-placed confidence" means confidence that has been placed in the wrong object — it is not necessarily false confidence but confidence invested in something that will not support it. The confidence itself might be genuine; what is ill-placed is where it has been directed. Similarly, "ill-placed trust" means trust invested in an unworthy object.
A trick to remember it
well-placed = "well positioned", from "place". For the figurative sense ("well-placed sources"), picture someone literally positioned in the right spot within the flow of information.
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"well-placed sources" in a news story are sources with...
The suffix -placed judges how well something is positioned: well-placed (in the right spot) versus ill-placed (poorly positioned). In Spanish it usually maps to bien situado / posicionado / ubicado.
"well" becomes "well-placed". It is a typical example of the -placed suffix.
Judges how solid the basis of a claim or fear is: well-founded (justified, based on good evidence) versus ill-founded (baseless).
Describes the position or depth of something: deep-set (sunk deeply) and well-set (firmly positioned).
Judges whether the moment chosen for something was right: well-timed versus ill-timed (badly timed).
-tion, -ness, -ful, -ly, -able... every ending you need to understand thousands of words at once.