Being attuned to something means being aware of it or being sensitive to it. There are many synonyms that can be used to convey the same idea. For example, one could use the word "tuned in" to describe someone who is keenly aware of their surroundings. Another synonym that may be used is "aware". Someone who is aware is "attuned to" their environment and the people around them. Other synonyms that can be used include "in tune", "responsive", "sensitive" and "perceptive". All of these words can be used interchangeably with "attuned to", depending on the context and the tone of the writing.