Workplace-Safe Casual Language

There is a sweet spot between stiff formal English and risky slang. "Sounds good" is friendlier than "Acknowledged" and safe with anyone. "No worries" softens "That's quite alright" without sounding too casual for a boss. "My bad" works for minor slip-ups in relaxed workplaces, but skip it in client emails. "I'll loop you in" means "I'll include you" and sounds both competent and modern. "Heads up" makes a perfectly professional warning: "Heads up — the deadline moved to Friday."

The test for workplace slang: would your manager use it? If yes, it is safe. If you have only heard it from the youngest intern, wait until you know the office culture better.