adj. Not adhering to convention or accepted standards
adj. Out of the ordinary
adj. Atypical
n. Something or someone that is unconventional.
The Century Dictionary and Cyclopedia
Not conventional; not bound by unswerving rules; free in character, action, or treatment.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. not conventional or conformist
adj. not conforming to accepted rules or standards
adj. not conforming to legality, moral law, or social convention
Word Usage
"The term unconventional resources is applied to a broad category of fuels like shale gas, tar sands and other forms of oil and gas that require sophisticated technology to extract and are typically more expensive to develop."