Dead right. It's impossible to describe sensations except in the weakest terms. There's no experiential vocabulary. If I tell someone I have a headache no one could appreciate the quality of my particular ache. If they've never had a headache the statement would be meaningless unless they've had other aches but that still wouldn't describe my headache.
Try to describe red without pointing to or describing an object that's red... It won't work.
Try to describe the taste of an apple. You could say sweet or sour or powdery or something but those qualities aren't limited to just apples. The sensation that gives a particular apple its appleness is unique to the individual.
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