What this suffix does
-versed describes how knowledgeable someone is about a topic: well-versed, poorly-versed. "well-versed in X" is a common way to say someone knows a topic well.

Suffix · forms adjectives
Describes how much someone knows about a subject: well-versed (highly knowledgeable) versus poorly-versed (having little knowledge).
Written by Bryan López, English teacher · Updated
-versed describes how knowledgeable someone is about a topic: well-versed, poorly-versed. "well-versed in X" is a common way to say someone knows a topic well.
Adverb + versed.
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.
-versed
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"Well-versed" implies deep knowledge of a specific area, practice, or tradition through sustained engagement. "Well-read" implies broad reading across literature and ideas in general. A person can be well-versed in contract law without being well-read, and well-read without being well-versed in any particular professional field. "Well-versed" typically points to specific domain knowledge; "well-read" points to general literary and intellectual formation.
"Well-versed" applies to any domain of knowledge, practice, or skill where deep engagement produces fluency: well-versed in the art of negotiation, well-versed in the customs of the region, well-versed in the techniques of a trade. It is not restricted to academic subjects.
A trick to remember it
well-versed comes from "to verse" (to go over something repeatedly until you master it, like a verse you memorize). Well-versed = you have gone over it so much you now master it.
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"poorly-versed" describes someone who is...
The suffix -versed describes how much someone knows about a subject: well-versed (highly knowledgeable) versus poorly-versed (having little knowledge). In Spanish it usually maps to versado / ducho / entendido en.
"well" becomes "well-versed". It is a typical example of the -versed suffix.
-tion, -ness, -ful, -ly, -able... every ending you need to understand thousands of words at once.