"Unobtrusiveness" Natural Recordings by Native Speakers
The quality of being unobtrusive, unnoticeable, or inconspicuous, often in a way that is considered polite or tactful in social situations. This often implies not drawing attention to oneself or one's presence, and being unobtrusively present or influencing a situation in a subtle manner.
Careless or unnoticing, often in a way that suggests a lack of attention or interest; lacking in awareness or perception. Not paying attention to or noticing something, especially something that should have been noticed.