Antonyms for the word "most stridulous" are calm, peaceful, gentle, quiet, and soothing. While "most stridulous" indicates a harsh, grating, or loud sound, these antonyms refer to a much softer or more tranquil environment. Calm implies a sense of serenity and minimal disturbance, while peaceful typically denotes a lack of conflict or tension. Gentle suggests a mild or tender touch, and quiet emphasizes a low level of noise or vibration. Soothing relates to something that reduces anxiety or tension and instills a sense of comfort and relaxation. These antonyms offer a stark contrast to the intensity and jarring nature of the term "most stridulous.