English

imperceptibleness

From imperceptible + -ness.

Formed from imperceptible + -ness

Latin perceptibilis ‘perceptible, participating (in anything)’

Medieval Latin imperceptibilis

Middle French imperceptible

Middle English imperceptible

Today it means

noun The quality of being imperceptible.

Language periods are conventional ranges, not dates for this word.

Etymograph / imperceptibleness