Synonyms of the word 
INCOGNOSCIBLE → IMPERCEPTIBLE - INCOGNIZABLE - UNPERCEIVABLE
incognoscible
- adj. (rare, dated) Not capable of being known; incomprehensible.
imperceptible
- adj. Not perceptible, not detectable, too small in magnitude to be observed.
incognizable
- adj. Not cognizable; incapable of being recognised.
unperceivable
- adj. Not perceivable; imperceptible.
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