invasive

from WordNet (r) 3.0 (2006)

invasive
    adj 1: relating to a technique in which the body is entered by
           puncture or incision [ant: {noninvasive}]
    2: marked by a tendency to spread especially into healthy
       tissue; "invasive cancer cells" [ant: {confined}]
    3: involving invasion or aggressive attack; "invasive war" [syn:
       {incursive}, {invading}, {invasive}]
    4: gradually intrusive without right or permission; "we moved
       back from the encroaching tide"; "invasive tourists";
       "trespassing hunters" [syn: {encroaching(a)}, {invasive},
       {trespassing(a)}]

from The Collaborative International Dictionary of English v.0.48

Invasive \In*va"sive\, a. [LL. invasivus: cf. F. invasif. See
   {Invade}.]
   1. Tending to invade; characterized by invasion; aggressive.
      "Invasive war." --Hoole.
      [1913 Webster]

   2. (Med.) tending to spread, especially tending to intrude
      into healthy tissue; -- used mostly of tumors. [Narrower
      terms: {malignant}] PJC]

from Moby Thesaurus II by Grady Ward, 1.0

28 Moby Thesaurus words for "invasive":
      advancing, assailing, assaulting, attacking, charging, driving,
      entering, in, inbound, incoming, incursionary, incursive,
      inflooding, inflowing, ingoing, ingressive, inpouring, interfering,
      interruptive, intervenient, intrusive, invading, invasionary,
      inward, inward-bound, irruptive, obtrusive, thrusting