How can i make a statement weaker and more open ended than with "i suspect"? "Could it be"? I didn't even wanted to back it up, it was more intended as an open

How can i make a statement weaker and more open ended than with "i suspect"? "Could it be"? I didn't even wanted to back it up, it was more intended as an open thought, but its seems it didn't get across in the heat of the thread.