No. 10,373 in Russian
важнейшей
"Most important" or "essential."
In a sentence
Сохранение природных ресурсов является важнейшей задачей человечества.
Preserving natural resources is humanity's most important task.
'важнейшей' is used in the instrumental case to emphasize the superlative importance of the task.
Одной из важнейших причин успеха является упорный труд.
One of the most important reasons for success is hard work.
'важнейших' is in the genitive plural, indicating its relation to 'причин' (reasons).
Важнейшая задача правительства — обеспечить безопасность граждан.
The government's most important task is to ensure the safety of citizens.
'Важнейшая' is in the nominative singular, directly describing 'задача' (task).
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