Not known to exist: an unsuspected disease. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unsuspected" in a sentence
"It's funny what a small world it is sometimes and the fact that you might meet people in unsuspected places."
"Nonetheless, nonexperimental research cannot exclude the potential effects of self-selection, that is, the possibility that some unsuspected factor perhaps even something genetic induces both religiosity and neighborliness, producing a spurious correlation, so that simply forcing people to attend church more often would not make them more neighborly."
"While we get glimpses of Lou's childhood, they mostly have to do with establishing that he's been a bad seed -- if an unsuspected one -- all of his life."