Jargon, pretentious language, euphemisms, doublespeak 2
Example:

Intentionally using a position of responsibility to harm other people is inexcusable.

Intentionally utilizing a position of responsibility to harm other people is malfeasance most foul.

The word utilizing is jargon; the phrase malfeasance most foul is flowery and pretentious; using and inexcusable are plain English alternatives.