유해하다

To be weak or easily affected/damaged by something. Often used regarding security, health, or social standing.

To spread or distribute something (like a disease, rumor, or culture) over a wide area or among many people.

The state of lacking something essential, such as nutrients, affection, or resources.

To increase or improve something like health, efficiency, or welfare.

To exhaust or completely use up resources, strength, or energy.

The identification of the nature of an illness or other problem by examination of the symptoms; an assessment or analysis of a situation.

A change which is a result or consequence of an action or other cause; the power to produce a desired result.

To keep or maintain a certain state, relationship, or level without change. It is used in contexts ranging from health to international relations.

An unintended, unpleasant, or harmful result of a drug, medical treatment, or even a policy or action.

A decline, lowering, or deterioration in level, quality, capability, or efficiency.