Synonyms of the word 
PERCEPTIBILITY → IMPERCEPTIBILITY
perceptibility
- n. The state, quality, or condition of being perceptible.
imperceptibility
- n. The state or quality of being imperceptible.
If you are interested in words, visit the following sites :
- wiktionary.org/perceptibility For complete definition of a word
- 1word.ws/perceptibility to play with words, suffixs, prefixs, etc.