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I've got some words for you (Score:2)
You need a word that's not so heavy as "persistent", which is also already in use with a different meaning, as you say.
So, here are some words for you:
My favorite is "sticky", which has a very informal feel about it.
Also, you may want to try out the Reverse Dictionary Lookup [onelook.com], throw some words at it, and see how you like the alternative words that it comes up with.
Lexical::Environment (Score:1)
Lexical::Environment
rjbs