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invasive (adj.)

"tending to invade, aggressive," mid-15c., invasif, from Old French invasif (15c.) or directly from Medieval Latin invasivus "invasive," from invas-, past-participle stem of invadere "go into; attack, invade," from in- "in" (from PIE root *en "in") + vadere "go, walk" (see vamoose).

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Definitions of invasive from WordNet

invasive (adj.)
gradually intrusive without right or permission;
invasive tourists
Synonyms: encroaching / trespassing
invasive (adj.)
relating to a technique in which the body is entered by puncture or incision;
invasive (adj.)
marked by a tendency to spread especially into healthy tissue;
invasive cancer cells
invasive (adj.)
involving invasion or aggressive attack;
invasive war
Synonyms: incursive / invading
From wordnet.princeton.edu