(adjective) Likely to be affected by or to experience something. Example: "He's subject to sneezing fits."
"What is called an educated person is often someone who has had a dangerously superficial exposure to a wide spectrum of subjects."
"Age is not a particularly interesting subject. Anyone can get old. All you have to do is live long enough."
"All things are subject to interpretation. Whichever interpretation prevails at a given time is a function of power and not truth."
"Well, honor is the subject of my story."