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1.

Deliberately misleading: intentionally misleading or fraudulent.

He acted very deceitful, lying about insurances to gain exrta money.
by Jafje June 06, 2007
 
2.
Giving someone the impression that they can trust you,but then doing something to spite them.
She broke up with her boyfriend after discovering his deceitful side.
by SomeoneNew June 19, 2012