| 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 |
| Notes: | use fatal for something which has caused someone's death; use lethal for something which is capable of killing someone |
Antonyms: |
beneficial, harmless, helpful, life-giving |
| 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: | deathly |
| Part of Speech: | adjective |
| Definition: | fatal |
Synonyms: |
deadly, extreme, intense, lethal, mortal, mortiferous, noxious, pestilent, pestilential, terrible |
Antonyms: |
benign, harmless, healthful, healthy, life-giving, strengthening |
| 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: | fateful |
| Part of Speech: | adjective |
| Definition: | deadly |
Synonyms: |
calamitous, cataclysmic, catastrophic, destructive, disastrous, fatal, lethal, mortal, ominous, ruinous |
Antonyms: |
healthful, healthy, life-giving |
| Main Entry: | homicidal |
| Part of Speech: | adjective |
| Definition: | murderous |
Synonyms: |
bloodthirsty, deadly, lethal, maniacal, slaughterous, violent |
| Main Entry: | malignant |
| Part of Speech: | adjective |
| Definition: | diseased |
Synonyms: |
cancerous, deadly, destructive, fatal, internecine, lethal, mortal, pestilential, poisonous |
Antonyms: |
benign, harmless, uncancerous |
| Main Entry: | mortal |
| Part of Speech: | adjective |
| Definition: | deadly |
Synonyms: |
bitter, death-dealing, deathly, destructive, dire, ending, extreme, fatal, grave, great, grievous, grim, intense, killing, last, lethal, malignant, merciless, monstrous, mortiferous, murderous, noxious, pestilent, pestilential, poisonous, relentless, remorseless, ruthless, severe, terminal, terrible, unrelenting |
Antonyms: |
invigorating, lifegiving, permanent, refreshing |
| Main Entry: | murderous |
| Part of Speech: | adjective |
| Definition: | difficult |
Synonyms: |
arduous, brutal, criminal, cruel, dangerous, deadly, destroying, destructive, devastating, exhausting, fell, ferocious, harrowing, hellish, killing, lethal, ruinous, sapping, savage, strenuous, unpleasant |
Antonyms: |
easy, facile, pleasant |
| 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 |