Intrusive
Part of speech: adjective
Definition: Tending or apt to intrude; doing that which is not welcome; interrupting or disturbing; entering without right or welcome. Of rocks: forced, while in a plastic or molten state, into the cavities or between the cracks or layers of other rocks.
Example sentence: The person who comes up to you and makes the most noise and is the most intrusive is invariably the person in the room who has no respect for you at all, and it's really all about them.
Irruptive
Part of speech: adjective
Definition: Having the quality of irrupting or making irruptions.