harmful

consider sth

Many people consider plastic bags harmful to the environment.

extremely, particularly, positively, very

Smoking is extremely harmful to your lungs and heart.

possibly, potentially

Eating too much salt could potentially be harmful to your health.

(not) necessarily

Eating chocolate is not necessarily harmful to your health if you consume it in moderation.

environmentally, socially

Smoking is widely known to be socially harmful in many modern workplaces.

to

Too much screen time can be harmful to children's sleep patterns.