That cheats; fraudulent, swindling, deceitful.

That ‘sharks’; †that oppresses by extortion (obsolete); that cheats, steals, cadges, or sponges.

That shaves, in the senses of the verb.

Cheating, swindling; dishonest.

That acts as a sharper, fraudulent, swindling, cheating, knavish.

slang (originally Horse Racing). depreciative. Esp. of a bookmaker or gambler: swindling, dishonest. Cf. blackleg, n. 2. Now historical and rare.

That engages in swindling, designating a swindler; acting or dealing in a fraudulent or dishonest manner.

Falsified, doctored.

colloquial. Esp. of account books or other financial records: fraudulently altered; doctored, falsified.

U.S. Finance. Originally blue sky and hot air. Of securities and other investments: sold under false pretences so as to increase the profits of…

= blue-sky, adj. (in various senses).