| 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: | baneful |
| Part of Speech: | adjective |
| Definition: | ruinous, injurious |
Synonyms: |
baleful, calamitous, deadly, deleterious, destructive, disastrous, evil, fatal, harmful, hurtful, malefic, noxious, pernicious, pestilent, pestilential, poisonous, venomous, wicked |
| Notes: | something is baleful that intends or portends harm or injury; something is baneful that produces harm or injury - thus, a glance may be baleful, an herb or poison baneful |
Antonyms: |
advantageous, beneficial, beneficient, fortunate, helpful, lucky |
| 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 |
| 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 |
| Main Entry: | malignant |
| Part of Speech: | adjective |
| Definition: | diseased |
Synonyms: |
cancerous, deadly, destructive, fatal, internecine, lethal, mortal, pestilential, poisonous |
Antonyms: |
benign, harmless, uncancerous |