Baneful, bad, and baleful are all synonyms for harmful. Beneficial and harmless are antonyms of harmful. And here are 33 another word for harmful.
Bad, baleful, baneful, corrupting, damaging, dangerous, deadly, deleterious, destructive, detrimental, disadvantageous, environmentally unfriendly, evil, hazardous, hurtful, injurious, lethal, maleficent, malevolent, malign, malignant, negative, noxious, pernicious, poisonous, subversive, toxic, unfavourable, unhealthy, unwholesome, wounding, and malefic are all synonyms for harmful.
Harmful synonym page has a variety of synonyms that differ in length. 1 synonym with 3, 4, 5, 12, 15, and 25 letters and 3 synonyms with 6, and 8 letters. 4 synonyms with 7, and 11 letters and 6 synonyms with 9 letters.
5 synonyms with 10 letters. For a total of 31 another word for harmful.
Smoking is harmful to health.
Harmful chemicals damage the environment.
Excessive stress can be harmful.
Certain habits are potentially harmful.