WordNet sense 1 (not straight; dishonest or immoral or evasive):

corrupt, crooked, crooked

WordNet sense 2 (not expressing or given to expressing the truth):

untruthful

WordNet sense 3 (designed to deceive):

false

WordNet sense 4 (designed to deceive or mislead either deliberately or inadvertently):

deceptive, misleading

WordNet sense 5 (intended to deceive):

deceitful, fraudulent

WordNet sense 6 (deceptive or fraudulent; disposed to cheat or defraud or deceive):

dishonorable

WordNet sense 7 (capable of being corrupted):

corruptible, purchasable, venal, bribable