caustic - Sarcastic or severely critical, often in a hurtful or biting manner; or able to burn or corrode organic tissue, typically referring to chemicals or substances.

The caustic chemical spilled onto the floor and quickly started to eat away at the floor surface.
hackneyed - (of a phrase or idea) lacking significance through having been overused; unoriginal and trite

Ricky was ready to tell his boss he was completely prepared for the job, but he wanted to avoid being told a hackneyed expression like "make sure you have his ducks in a row."