n.the quality of not sticking out in an unwelcome way

Unobtrusiveness and efficiency in idle cycle stealing for PC grids
Unobtrusiveness in mHealth Design and Use: A Systematic Literature Study
Phone privacy and unobtrusiveness via voice cancellation
The road towards unobtrusiveness: Kinetic User Interfaces
Balancing Salience and Unobtrusiveness in Auditory Monitoring of Evolutionary Optimization
RightOnTime: The Role of Timing and Unobtrusiveness in Behavior Change Support Systems
RightOnTime: The Role of Timing and Unobtrusiveness in Behavior Change Support Systems
RightOnTime: The Role of Timing and Unobtrusiveness in Behavior Change Support Systems
Empirical evaluation of combining unobtrusiveness and security requirements in multimodal biometric systems
Empirical evaluation of combining unobtrusiveness and security requirements in multimodal biometric systems