disparate

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Fundamentally distinct or different in kind; entirely dissimilar.
• adjective Containing or composed of dissimilar or opposing elements.

from The Century Dictionary.

• Essentially different; of different species, unlike but not opposed in pairs; also, less properly, utterly unlike; incapable of being compared; having no common genus.
• noun One of two or more things or characters of different species; something that is opposite but not contrary.
• In the psychology of sensation, belonging to or derived from different senses (said of sensations); appealing to different senses (said of stimuli).

from the GNU version of the Collaborative International Dictionary of English.

• adjective Unequal; dissimilar; separate.
• adjective (Logic) Pertaining to two coördinate species or divisions.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Composed of inherently different or distinct elements; incongruous.
• adjective Essentially different; of different species, unlike but not opposed in pairs; also, less properly, utterly unlike; incapable of being compared; having no common genus.
• noun Any of a group of unequal or dissimilar things.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective including markedly dissimilar elements
• adjective fundamentally different or distinct in quality or kind