Underhanded

[Dave Paprocki]

Insufficiently provided with hands or workers;
short-handed; sparsely populated.

[Tanya Shivari]

[Cheap] (not referring to [money]); [unfair].

[Justin Bieber]

done secretly, and sometimes dishonestly, in order to achieve an advantage:

[Becky]

Acting or done in a secret or dishonest way.