Harmful
Synonyms Damaging, detrimental, deleterious, negative, unhealthy, hurtful, wounding, environmentally unfriendly, hazardous, toxic, lethal, evil, malignant, corrupting, pernicious, maleficent, injurious, dangerous, unfavourable, disadvantageous, unwholesome, baleful, destructive, noxious, poisonous, deadly, bad, malign, malevolent, subversive, baneful, and malefic.
Example Sentences
Smoking is harmful to health.
Harmful chemicals damage the environment.
Excessive stress can be harmful.
Certain habits are potentially harmful.