| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | contagious (disease) |
| Synonyms: | communicable, dangerous, endemic, epidemic, epizootic, infectious, infective, miasmatic, pandemic, pestiferous, pestilential, taking, transferable, transmittable |
| Antonyms: | uncontagious |
| 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: | 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, poison, septic, toxic, toxicant, toxiferous, venomous, vicious, viperous, virulent |
| Antonyms: | benevolent, harmless, non-toxic |
| Main Entry: | mephitical |
| Part of Speech: | adjective |
| Definition: | poisonous |
| 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, poison, septic, toxic, toxicant, toxiferous, venomous, vicious, viperous, virulent |
| Main Entry: | toxicant |
| Part of Speech: | adjective |
| Definition: | poisonous |
| Synonyms: | bad*, baleful, baneful, corrupt, corruptive, dangerous, deadly, deleterious, destructive, detrimental, evil, fatal, hurtful, infective, lethal, malicious, malignant, mephitic, mephitical, miasmatic, morbid, mortal, nocuous, noisome, noxious, peccant, pernicious, pestiferous, pestilential, poison, septic, toxic, toxiferous, venomous, vicious, viperous, virulent |