Sounding off is a term used to describe someone who is expressing their opinion in a loud and forceful manner. RANTING (7 letters) is a form of sounding off that involves speaking in an angry or agitated way. RAVING (6 letters) is another form of sounding off that involves speaking in an excited or enthusiastic way. BOASTING (8 letters) is the last form of sounding off, which involves speaking in a proud or boastful way.