Antonyms for the word "more tranquillizing" could be words like agitating, disturbing or unsettling. Rather than promoting calm and relaxation, these words suggest restlessness, chaos, and unease. Other opposing words could include stimulation, excitement, and animation- these terms describe experiences that are active, energizing, and invigorating. Alternatively, words like irritating, annoying, and vexing can offer the opposite meaning of tranquility- these words suggest anger, impatience, and frustration. In contrast, calm, collected, and composed, may offer a more nuanced antonym for "more tranquillizing," as they allude to the state of being peaceful and self-assured.