From The Collaborative International Dictionary of English v.0.44 [gcide]:
Invasive \In*va"sive\, adjective [LL. invasivus: cf. F. invasif. See {Invade}.]
1. Tending to invade; characterized by invasion; aggressive. ''Invasive war.'' --Hoole.
2. (Med.) tending to spread, especially tending to intrude into healthy tissue; -- used mostly of tumors. [Narrower terms: {malignant}] PJC]
From The Collaborative International Dictionary of English v.0.44 [gcide]:
malignant \ma*lig"nant\, adjective [L. malignans, -antis, p. pr. of malignare, malignari, to do or make maliciously. See {Malign}, and cf. {Benignant}.]
1. Disposed to do harm, inflict suffering, or cause distress; actuated by extreme malevolence or enmity; virulently inimical; bent on evil; malicious.
A malignant and a turbaned Turk. --Shak.
2. Characterized or caused by evil intentions; pernicious. ''Malignant care.'' --Macaulay.
Some malignant power upon my life. --Shak.
Something deleterious and malignant as his touch. --Hawthorne.
3. (Med.) Tending to produce death; threatening a fatal issue; virulent; as, malignant diphtheria.
{Malignant pustule} (Med.), a very contagious disease produced by infection of subcutaneous tissues with the bacterium {Bacillus anthracis}. It is transmitted to man from animals and is characterized by the formation, at the point of reception of the infection, of a vesicle or pustule which first enlarges and then breaks down into an unhealthy ulcer. It is marked by profound exhaustion and often fatal. The disease in animals is called {charbon}; in man it is called {cutaneous anthrax}, and formerly was sometimes called simply {anthrax}. [1913 Webster +PJC]
From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. A man of extreme enmity or evil intentions. --Hooker.
2. (Eng. Hist.) One of the adherents of Charles I. or Charles II.; -- so called by the opposite party.
From WordNet (r) 2.0 [wn]:
adjective
1: dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor) [ant: {benign}]
2: extremely malevolent or malicious; "the malignant tongues of gossipers" [syn: {malevolent}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
157 Moby Thesaurus words for "malignant": acrid, allergic, anemic, antagonistic, antipathetic, apoplectic, arthritic, atrocious, baleful, baneful, barbaric, barbarous, belligerent, bestial, bilious, bitchy, bitter, bloody, brutal, brutish, cancerous, catching, caustic, chlorotic, clashing, colicky, colliding, communicable, conflicting, consumptive, contagious, corroding, corrosive, corrupting, corruptive, counterproductive, cussed, damaging, deadly, death-bringing, deathful, deathly, deleterious, despiteful, destructive, detrimental, devilish, diabolical, disadvantageous, disserviceable, distressing, dropsical, dyspeptic, edematous, encephalitic, envenomed, epileptic, evil, fatal, feral, ferine, ferocious, fiendish, fierce, full of hate, harmful, hateful, hostile, hurtful, infectious, infective, inhuman, iniquitous, injurious, internecine, invidious, kill-crazy, killing, laryngitic, leprous, lethal, luetic, malarial, malefic, maleficent, malevolent, malicious, malign, mean, measly, mephitic, merciless, miasmal, miasmatic, miasmic, mischievous, mortal, murderous, nasty, nephritic, neuralgic, neuritic, noisome, noncivilized, noxious, ominous, ornery, palsied, paralytic, pernicious, pestiferous, pestilential, phthisic, pitiless, pleuritic, pneumonic, pocky, podagric, poisonous, prejudicial, quarrelsome, rachitic, rancorous, repugnant, rheumatic, rickety, ruthless, sanguinary, savage, scatheful, scorbutic, scrofulous, set against, sore, spiteful, tabetic, tabid, tameless, toxic, toxicant, toxiferous, tubercular, tuberculous, tumorigenic, tumorous, uncivilized, ungentle, untamed, venenate, veneniferous, venenous, venomous, vicious, virulent, vitriolic, wicked, wild
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