in ‧ va ‧ sive /ɪnˈveɪsɪv/ BrE AmE adjective
1 . invasive medical treatment involves cutting into someone’s body:
invasive surgery
2 . an invasive disease spreads quickly and is difficult to stop:
invasive bladder cancers
3 . an invasive plant spreads quickly in a garden or other area, so that it becomes a problem