Definitions
1.AdjectiveTending to intrude; doing that which is not welcome; interrupting or disturbing; entering without permission or welcome."Did it ever cross your mind that he might find all those questions you ask intrusive?"
2.AdjectiveOf rocks: forced, while in a plastic or molten state, into the cavities or between the cracks or layers of other rocks.
3.Adjectiveepenthetic
4.AdjectiveDesignating a type of collection in which each item keeps track of what collection it is in, rather than the more conventional approach of a collection keeping track of what items it contains. An intrusive collection does not "own" its contents and a single item can be part of multiple intrusive collections."an intrusive linked list"
5.NounAn igneous rock that is forced, while molten, into cracks or between other layers of rock