用よう心じん堅けん固ご

noun, na-adjective

extremely cautious; taking every precaution

Emphasizes a state of being thoroughly on guard, leaving nothing to chance. Often used in formal or written contexts.

• 用よう心じん堅けん固ごな警けい備び体たい制せいが敷しかれた。

  An extremely cautious security system was put in place.

• 彼かれは用よう心じん堅けん固ごに行こう動どうし、危き険けんを避さけた。

  He acted with great caution and avoided danger.