随ずい意い的てき

na-adjective

voluntary; optional

Used to describe actions, decisions, or participation that are left to one's own will or discretion, not compulsory. Often used in formal or written contexts.

• この研けん修しゅうへの参さん加かは随ずい意い的てきです。

  Participation in this training is voluntary.

• 保ほ険けんの加か入にゅうは随ずい意い的てきだが、勧すすめられる。

  Enrollment in the insurance is optional, but recommended.