Meretricious

\mer-i-TRISH-uhs\
...............like or pertaining to a prostitute;
.....................based on pretense, deception, insincerity

Synonyms: flashy, tastelessly showy, tawdry, gaudy, spurious, sham, false

Example1. She was rumored to be involved in a meretricious relationship with her boss.
Example2. It was such a mechanical and meretricious melodrama. It could have been done better.

dictionary.com page link for meretricious