1. the state or quality of being secure; safety from danger, harm, or loss
Usage: less common than ‘security’

Examples

• The secureness of the building impressed the safety inspector.
• She valued the secureness of her job above all else.
• The secureness of the vault made it ideal for storing valuables.
• Parents worry about the secureness of their children’s online activities.
• The secureness of the investment attracted many cautious buyers.