Is it right to write with profound regards at end of a letter?

Well, honey, it's not a crime to sign off with "profound regards," but let's be real, it's a bit old-fashioned. If you want to sound more modern and casual, just stick with a simple "regards" or "sincerely." But hey, if you're feeling fancy, go ahead and sprinkle in those profound regards - just don't be surprised if people raise an eyebrow.