intrusive (
http://definr.com/intrusive)
adj 1: tending to intrude (especially upon privacy); "she felt her
presence there was intrusive" [ant:
unintrusive]
2: (geology) of rock material; forced while molten into cracks
between layers of other rock [ant:
extrusive]
3: thrusting inward; "an intrusive arm of the sea" [ant:
protrusive]