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What does "unused root" mean?

Often when I search for the origins and meanings of certain words in Tanach, I'll come across something like Strong's saying that it's from or probably from an "unused root". For example:
~~![Kenaz](https://languages.codidact.com/uploads/qxhDpEKWPH7AZNJfvECmKA6n)~~
What exactly is an "unused root" and if it's "unused", how does one determine its meaning?

Often when I search for the origins and meanings of certain words in Tanach, I'll come across something like Strong's saying that it's from or probably from an "unused root". For example:
![Strong's Exhaustive Concordance: Kenaz: Probably from an unused root meaning to hunt; hunter; Kenaz, the name of an Edomite and of two Israelites -- Kenaz.](https://languages.codidact.com/uploads/qxhDpEKWPH7AZNJfvECmKA6n)
What exactly is an "unused root" and if it's "unused", how does one determine its meaning?

Hebrew etymology