imperceptible   (Sound)

The imperceptible has 1 Senses.

• imperceptible, unperceivable
• はつか
• impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"
• 心または感覚によって認めるのが不可能であるか難しい