This is the 510th most frequent Finnish word.
hyviä
"Hyviä" means "good" in plural form (partitive case) in English.
Here, 'hyviä' is used as part of a greeting, in the plural partitive form, to express well-wishing.
Hyviä iltoja toivotettiin kaikille vieraille.
Good evenings were wished to all guests.
The word 'hyviä' is the plural partitive form of the adjective 'hyvä', used here because the noun 'kirjoja' (books) is treated as indefinite and partitive.
Pöydällä on hyviä kirjoja.
There are good books on the table.
The word 'hyviä' is in its plural partitive form, matching the noun 'aterioita' (meals) in both number (plural) and case (partitive), as the verb 'nauttii' (enjoys) requires the partitive case.