do you say unperceivable or imperceivable?
 

I think and say 'imperceivable', and I see the word used frequently however it's not in the dictionary :( the word in the dictionary is 'unperceivable'... I did a search on google: imperceivable is used every where :helpme

I would more likely use - unimaginable , then either of those.

Hmm.. neither I think.. I might say imperceptible once in a while.

the difference being imagination and sight, they can't imagine as opposed to they can't see...