"Striking note" refers to a sound or tone that is notably impressive or memorable. Antonyms for this phrase may include mild, unremarkable, plain or ordinary. A striking note stands out and captures attention, while its antonyms blend in and go unnoticed. Other antonyms might include dull, forgettable, unimpressive or banal. When describing sounds or tones, choosing the appropriate antonym can help accurately convey the desired message. Whether you are discussing music, speech or any auditory experience, knowing the right vocabulary can elevate your communication and better express your thoughts and ideas.