2 = mendacious, lying, deceitful.
Ex. I love movies like that -- where slowly, gradually, bit by bit, all the characters realize that the villain was really disastrously mendacious and criminal.
Ex. The board clearly didn't care if its commissioner was a lowdown, lying, corrupt and untrustworthy creep, likely because that is the nature of the entire organization.
Ex. Again, on the matter of the sources already consulted by the enquirer, the implication is not that he is unreliable or deceitful, but that in looking up the Encyclopedia Americana he may not be aware of the existence of the index.

Spanish-English dictionary. 2013.