Not mediated; unconnected; unrelated; lacking a common middle term.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. having no intervening persons, agents, conditions
Word Usage
"He spends at least an hour a day blogging; Mr. Maeda's entries are "unmediated" -- another way of saying unedited -- "so you get the real me, typos, spelling mistakes, you name it.""