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| Main Entry: |
poisonous
 [poi-zuh-nuhs] 
|
| 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: | contagious |
| Part of Speech: | adjective |
| Definition: | communicable |
| Synonyms: | catching, deadly, endemic, epidemic, epizootic, impartible, infectious, inoculable, pestiferous, pestilential, poisonous, spreading, taking, transmissible, transmittable |
| Antonyms: | noncommunicable |
| 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 |
| Antonyms: | animating, energizing, harmless, healthful, healthy, invigorating, wholesome |
Example Sentences
- There is no trade-off between food and fuel either, because the oil is poisonous.
- All parts, especially seeds, are poisonous if ingested.
- We learned the difference between venomous and poisonous.
| Main Entry: | fatal |
| Part of Speech: | adjective |
| Definition: | deadly, lethal |
| Synonyms: | baleful, baneful, calamitous, cataclysmic, catastrophic, deathly, destructive, disastrous, fateful, final, ill-fated, ill-starred, incurable, inevitable, killing, malefic, malignant, mortal, mortiferous, noxious, pernicious, pestilent, pestilential, poisonous, ruinous, terminal, virulent |
| Antonyms: | healthful, life-giving, nourishing, vital, wholesome |
| Main Entry: | hurtful |
| Part of Speech: | adjective |
| Definition: | injurious, cruel |
| Synonyms: | aching, afflictive, bad, cutting, damaging, dangerous, deadly, deleterious, destructive, detrimental, disadvantageous, distressing, evil, harmful, hurting, malicious, mean, mischievous, nasty, nocuous, noxious, ominous, pernicious, poisonous, prejudicial, spiteful, unkind, upsetting, wounding |
| Antonyms: | aiding, assisting, harmless, helpful, helping, kind, nice, relieving |
| Main Entry: | injurious |
| Part of Speech: | adjective |
| Definition: | hurtful |
| Synonyms: | abusive, adverse, bad, baneful, corrupting, damaging, dangerous, deadly, deleterious, destructive, detrimental, disadvantageous, evil, harmful, iniquitous, insulting, libeling, mischievous, nocent, nocuous, noxious, opprobrious, pernicious, poisonous, prejudicial, ruinous, slanderous, unconducive, unhealthy, unjust, wrongful |
| Antonyms: | aiding, assisting, beneficial, constructive, curing, fixing, good, healing, helpful, mending, nice |
| Main Entry: | lethal |
| Part of Speech: | adjective |
| Definition: | deadly |
| Synonyms: | baleful, dangerous, deathly, destructive, devastating, fatal, harmful, hurtful, malignant, mortal, mortiferous, mortuary, murderous, necrotic, noxious, pernicious, pestilent, pestilential, poisonous, virulent |
| Antonyms: | beneficial, harmless, helpful, life-giving |
| Main Entry: | malicious |
| Part of Speech: | adjective |
| Definition: | hateful |
| Synonyms: | awful, bad-natured, baleful, beastly, bitter, catty, cussed, deleterious, despiteful, detrimental, envious, evil, evil-minded, green*, green-eyed, gross*, ill-disposed, injurious, jealous, low, malevolent, malign, malignant, mean, mischievous, nasty, noxious, ornery, pernicious, petty, poisonous, rancorous, resentful, spiteful, uncool, vengeful, venomous, vicious, virulent, wicked |
| Antonyms: | benevolent, friendly, good, kind, likeable, sympathetic, thoughtful |
* = informal/non-formal usage
| Main Entry: | malignant |
| Part of Speech: | adjective |
| Definition: | diseased |
| Synonyms: | cancerous, deadly, destructive, fatal, internecine, lethal, mortal, pestilential, poisonous |
| Antonyms: | benign, harmless, uncancerous |
Roget's 21st Century Thesaurus, Third Edition
Copyright © 2012 by the Philip Lief Group.
Cite This Source
Copyright © 2012 by the Philip Lief Group.
Cite This Source
Dictionary.com, LLC. Copyright © 2012. All rights reserved.
