the GNU version of the Collaborative International Dictionary of English
adj. Capable of being imagined; conceivable.
The Century Dictionary and Cyclopedia
Capable of being imagined or conceived.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. capable of being imagined
Word Usage
"It was not yet daylight, we spent the entire day and evening traversing some of the most frightening terrain imaginable regaining our composure and impatient horses after midnight."