| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | harmful, damaging |
| Synonyms: | bad, destroying, destructive, detrimental, hurtful, injurious, mischievous, nocent, nocuous, pernicious, prejudicial, prejudicious, ruining, ruinous |
| Antonyms: | aiding, assisting, helpful |
| 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: | corrupt |
| Part of Speech: | adjective |
| Definition: | debased, vicious |
| Synonyms: | abandoned, abased, baneful, boorish, degenerate, degraded, deleterious, depraved, dishonored, dissolute, evil, flagitious, infamous, loose, low, miscreant, monstrous, nefarious, perverse, profligate, rotten, villainous |
| Antonyms: | clean, decent, helpful, high, kind, noble, sound, wholesome |
| Main Entry: | costly |
| Part of Speech: | adjective |
| Definition: | harmful, damaging |
| Synonyms: | catastrophic, deleterious, disastrous, loss-making, ruinous, sacrificial |
| Antonyms: | aiding, helpful |
| Main Entry: | damaging |
| Part of Speech: | adjective |
| Definition: | hurtful to reputation |
| Synonyms: | bad, deleterious, detrimental, disadvantageous, evil, harmful, injurious, mischievous, nocent, nocuous, prejudicial, ruinous |
| Antonyms: | beneficial, favorable, helpful |
| 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: | destructive |
| Part of Speech: | adjective |
| Definition: | hurtful, disparaging |
| Synonyms: | abrasive, adverse, antagonistic, cankerous, caustic, contrary, corrosive, deleterious, derogatory, detrimental, discouraging, discrediting, erosive, hostile, injurious, invalidating, negative, offensive, opposed, troublesome, undermining, vicious |
| Antonyms: | encouraging, hopeful, positive |
| Main Entry: | detrimental |
| Part of Speech: | adjective |
| Definition: | damaging, disadvantageous |
| Synonyms: | adverse, bad, baleful, deleterious, destructive, disturbing, evil, harmful, hurtful, ill, inimical, injurious, mischievous, negative, nocuous, pernicious, prejudicial, unfavorable |
| Antonyms: | advantageous, assisting, beneficial, helpful, profitable |