最さい重じゅう要よう

na-adjective, noun which may take the genitive case particle 'no'

most important; top priority

Used to describe the single most important thing, issue, or factor. Often appears in formal or business contexts.

• 安あん全ぜんが最さい重じゅう要ようだ。

  Safety is the most important thing.

• これは最さい重じゅう要よう課か題だいです。

  This is a top-priority issue.