invasive

noun

An invasive organism, as, a plant or animal.

1. That invades a foreign country using military force.
2. Relating to military aggression generally.
3. (of a plant or animal) That grows in environments which do not harbor natural enemies, often to the detriment of native species or of food or garden flora and fauna.

   an invasive species

4. (of a carcinoma etc) That invades healthy tissue; (of a procedure) in which part of the body is entered
5. Intrusive on one's privacy.
6. Coming from outside; originating externally.