Clandestine
To be done in secret
Disingenuous
Pretending to be unaware or unsophisticated
Dissemble
To hide ones feeling behind false appearance
Forthright
Direct
Nefarious
Infamous
Perfidious
Disloyal
Probity
Uprightness
Scrupulous
Having strict principles
Spurious
Not genuine
Belie
To depict falsely