untruthful (adj.)

• artful
• calculating
• crafty
• deceitful
• deceptive
• delusive
• delusory
• dishonest
• disingenuous
• equivocal
• false
• inaccurate
• incorrect
• insincere
• knavish
• lying
• mendacious
• misleading
• roguish
• scheming
• shifty
• wrong