1.Definition: gradually intrusive without right or permission

"Invasive tourists"

Related Adjective(s):encroaching, trespassing

2.Definition: involving invasion or aggressive attack

"Invasive war"

Related Adjective(s):incursive, invading

3.Definition: marked by a tendency to spread especially into healthy tissue

"Invasive cancer cells"

4.Definition: relating to a technique in which the body is entered by puncture or incision