misrepresent

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

• transitive verb To give an incorrect or misleading representation of.
• transitive verb To serve incorrectly or dishonestly as an official representative of.

from The Century Dictionary.

• To represent erroneously or falsely; give a false or incorrect account or representation of, whether intentionally or not.
• To fail to represent correctly or in good faith as agent or official representative; act contrary to the wishes or interests of, as of one's principal or constituents, in the transaction of business, legislation, etc.
• To convey a false impression.

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

• transitive verb To represent incorrectly (almost always, unfavorably); to give a false or erroneous representation of, either maliciously, ignorantly, or carelessly.
• intransitive verb To make an incorrect or untrue representation.

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

• verb To represent falsely; to inaccurately portray something.

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

• verb tamper, with the purpose of deception
• verb represent falsely