Chiseler

[Sonia]

Historically linked to [thieves], but more recently associated with just about anything. Someone who picks something apart a tiny bit at a time. One can [chisel] on anothers stash, their money, their air, their space, their game, their [well-being]...whatever.

[Julene]

A person who wins by [deception], by sharp practice, is a cheat and generally a [low-life] [swindler]. Someone who cannot be trusted, particularly at business.