I recently remarked "I hate it when I accidentally touch a random moist paper towel in the trash.", at which point I questioned my usage of the term random in that instance.
There are good discussions of the term random here and here. But my question is in regard to how to more precisely communicate the meaning of random that I had intended. The best way I can think of to state it would be "of unknown origin", i.e.:
"I hate it when I accidentally touch a moist paper towel of unknown origin in the trash."
However this is awkward. Is there a shorter, but still precise, fashion to communicate this?
If there are multiple words/phrases that might fit this usage, I'd give preference to brevity without losing specificity. And note that I'm not asking for alternate ways to express arbitrary choices.