Machinator

·noun One who machinates, or forms a scheme with evil designs; a plotter or artful schemer.

machinator
māchĭnātor, ōris, m. [machinor], a maker of machines, a machinist, an engineer, architect (class.). ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
machinator
māchinātor ōris, m machinor, a contriver, designer, engineer, architect : tormentorum, L.— Fig., ...

An Elementary Latin Dictionary