| Main Entry: | toxic |
| Part of Speech: | adjective |
| Definition: | poisonous |
Synonyms: |
baneful, deadly, harmful, lethal, mephitic, noxious, pernicious, pestilential, poison, septic, toxicant, venomous, virulent |
Antonyms: |
harmless, nonpoisonous |
| Main Entry: | deadly |
| Part of Speech: | adjective |
| Definition: | causing end of life |
Synonyms: |
baleful, baneful, bloodthirsty, bloody, cannibalistic, carcinogenic, cruel, dangerous, death-dealing, deathly, deleterious, destroying, destructive, fatal, grim, harmful, homicidal, injurious, internecine, killing, lethal, malignant, mortal, mortiferous, murderous, noxious, pernicious, pestiferous, pestilent, pestilential, poisonous, ruthless, savage, slaying, suicidal, toxic, unrelenting, venomous, violent, virulent |
| Notes: | deadly means causing or capable of causing death while deathly means having the physical appearance of death |
Antonyms: |
animating, energizing, harmless, healthful, healthy, invigorating, wholesome |
| Main Entry: | destructive |
| Part of Speech: | adjective |
| Definition: | injurious, devastating |
Synonyms: |
annihilative, baleful, baneful, calamitous, cancerous, cataclysmic, catastrophic, consumptive, cutthroat, damaging, deadly, deleterious, detrimental, dire, disastrous, eradicative, evil, extirpative, fatal, fell, harmful, hurtful, internecine, lethal, lethiferous, mortal, noisome, noxious, pernicious, pestiferous, pestilential, ruinous, slaughterous, suicidal, toxic, venomous, wrackful, wreckful |
Antonyms: |
aiding, assisting, building, creative, helpful, productive |
| Main Entry: | harmful |
| Part of Speech: | adjective |
| Definition: | injurious, hurtful |
Synonyms: |
adverse, bad, baleful, baneful, calamitous, cataclysmic, catastrophic, consumptive, corroding, corrupting, crippling, damaging, deleterious, destructive, detrimental, dire, disadvantageous, disastrous, evil, harassing, incendiary, inimical, internecine, malefic, malicious, malignant, menacing, mischievous, murderous, nocuous, noxious, painful, pernicious, pestiferous, pestilential, risky, ruinous, sinful, sinister, subversive, toxic, undermining, unhealthy, unsafe, unwholesome, virulent |
| Main Entry: | infectious |
| Part of Speech: | adjective |
| Definition: | catching, spreading |
Synonyms: |
communicable, contagious, contaminating, corrupting, defiling, diseased, epidemic, infective, mephitic, miasmic, noxious, pestilent, pestilential, poisoning, polluting, toxic, transferable, transmittable, virulent, vitiating |
Antonyms: |
antiseptic, germless, harmless, non-infectious, uncommunicable, uncontagious |
| Main Entry: | noxious |
| Part of Speech: | adjective |
| Definition: | deadly, injurious |
Synonyms: |
baneful, corrupting, dangerous, deleterious, destructive, detrimental, fetid, foul, harmful, hurtful, insalubrious, insalutary, noisome, pernicious, pestiferous, pestilent, pestilential, poisonous, putrid, sickly, spoiled, stinking, toxic, unhealthful, unhealthy, unwholesome, venomous, virulent |
Antonyms: |
curing, good, healthy, helpful, hygienic, pure, sterile, wholesome |
| Main Entry: | pernicious |
| Part of Speech: | adjective |
| Definition: | bad, hurtful |
Synonyms: |
baleful, damaging, dangerous, deadly, deleterious, destructive, detrimental, devastating, evil, fatal, harmful, iniquitous, injurious, killing, lethal, maleficent, malevolent, malicious, malign, malignant, miasmatic, miasmic, mortal, nefarious, noisome, noxious, offensive, pestiferous, pestilent, pestilential, poisonous, prejudicial, ruinous, sinister, toxic, venomous, virulent, wicked |
Antonyms: |
helpful, innocuous, kind, lovable, loving |
| Main Entry: | poison/poisonous |
| Part of Speech: | adjective |
| Definition: | harmful |
Synonyms: |
bad, baleful, baneful, corrupt, corruptive, dangerous, deadly, deleterious, destructive, detrimental, evil, fatal, hurtful, infective, lethal, malicious, malignant, mephitic, miasmatic, morbid, mortal, nocuous, noisome, noxious, peccant, pernicious, pestiferous, pestilential, septic, toxic, toxicant, toxiferous, venomous, vicious, viperous, virulent |
Antonyms: |
aiding, antidotal, assisting, curing, healing, helpful |
| Main Entry: | venomous |
| Part of Speech: | adjective |
| Definition: | poisonous; hateful |
Synonyms: |
accidentally on purpose, antagonistic, baleful, baneful, catty, cussed, deadly, destructive, dirty, evil, hostile, lethal, malefic, malevolent, malicious, malign, malignant, mean, mephitic, noxious, ornery*, rancorous, savage, spiteful, toxic, toxicant, vicious, vindictive, viperish, viperous, virulent, waspish |
Antonyms: |
kind, praising, unpoisonous |
| Main Entry: | virulent |
| Part of Speech: | adjective |
| Definition: | poisonous, lethal |
Synonyms: |
baneful, deadly, destructive, fatal, harmful, infective, injurious, malign, malignant, mephitic, pernicious, poison, septic, toxic, toxicant, unhealthy, unwholesome, venomous |
Antonyms: |
harmless, healthy, nonpoisonous |