prone to
1. Inclined or likely to do something. The boss is prone to get irate when someone disagrees with him, even if he's clearly wrong. The comedian is prone to saying pretty offensive things during her stand-up routine.
2. Susceptible to something; readily affected by something. He's prone to illness, so his mother makes him stay indoors a lot. I'm prone to nausea when I travel by boat.
prone to something
likely to [do] something; apt to have something. My boss is prone to anger when my work isn't done on schedule. My sister is prone to sneezing because of her allergies.