When it comes to expressing agreement, there are plenty of different words and phrases you can use to get your point across. One common synonym for "be agreeable" is "concur," which is used to show that you are in agreement with someone else's opinion or idea. Other synonyms include "assent," "acquiesce," and "comply," all of which convey a sense of willingness to go along with someone else's wishes. You might also use phrases like "see eye to eye," "be of one mind," or "be on the same page" to express agreement in a slightly less formal way. Whatever the case, there are plenty of ways to show that you are in agreement with others and ready to work together towards a common goal.