A large number of people who are not specifically identified; the unspecified many.
インターネット上の投稿は不特定多数の人に見られる可能性がある。
Posts on the internet can be seen by an unspecified large number of people.
個人情報が不特定多数に漏れてしまった。
Personal information was leaked to an unspecified large number of people.
このイベントは不特定多数の参加を想定している。
This event is intended for participation by an unspecified large number of people.