This is the 10746th most frequent Russian word.
вредны
"Harmful."
The word 'вредны' is used as a predicate describing the noun 'сладости' (sweets), indicating a harmful attribute.
Сладости вредны для зубов.
Sweets are harmful to teeth.
Here, 'вредны' functions as a comparative attribute associated with 'несвежие продукты' (stale food), emphasizing a negative health impact.
Несвежие продукты особенно вредны для здоровья.
Stale food is especially harmful to health.
In this sentence, 'вредны' serves as a predicate adjective for the compounded subject 'курение и алкоголь' (smoking and alcohol), illustrating their damaging effects.