The quality of being imperceptible; something that is hard to notice or detect.

अदृश्यता

English Usage: The imperceptibility of the changes in temperature made it difficult to determine if the experiment was working.

Hindi Usage: तापमान में परिवर्तन की अदृश्यता ने यह तय करना कठिन बना दिया कि प्रयोग सफल हो रहा है।