Word for trying to appear noble

Question

What's the word to describe someone who acts like they are very honorable and have very noble intentions, when it's really not the case?

E.g. "Yeah I happened to see his wallet on the floor and wanted to return it to him as soon as I got it

Note(his intention was to steal it but he was unable to as he was caught and tries to cover it up)

Answer 1

You might try disingenuous

Defined by Merriam Webster as:

lacking in candor;

also: giving a false appearance of simple frankness: calculating

Answer 2

I suggest:

• He's a fake (or, better, "he's faking it")
• He's a scammer
• She's bogus (adjective i.e. not "a bogus)
• She's a fraud
• He's a sham
• She's a pretender

You have quite a lot of choices for this situation.

Answer 3

Consider Tartuffe (also lower case)

A religious hypocrite, or a hypocritical pretender to excellence of any kind.

Similarly, Pharisee

A self-righteous person; a hypocrite.

Oxford Dictionaries Online