When looking for synonyms for the word "more low keyed," you may want to consider words like subdued, muted, understated, and restrained. These words all convey a sense of quietness or moderation, and can be used to describe someone or something that is not overly flashy or attention-grabbing. Other possible synonyms might include hushed, soft-spoken, introverted, and unassuming. Depending on the context in which you are using the phrase "more low keyed," some of these words may be more appropriate than others. No matter which words you choose, however, the goal is always to convey a sense of calmness and tranquility.