I don't know where your dictionary got "simple" from. I suggest that you get something better. Even the much maligned Green Goddess (a.k.a. the Kenkyusha J-E Dictionary)lists six different meanings--with examples.

I would also suggest that, in future, you address such queries to HONYAKU, the J-E translation mailing list. WARNING: Traffic runs over 50 messages a day.

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I'm afraid there's some repetition... but if you restrict the word Sappari to taste, it's something that's not too strong in taste. If one is a Japanese, he might feel just plain rice with pickles and miso-soup is Sappari, while Italian food with lots of cheese and olive oil as the opposite of Sappari - Kudoi.

Example: when cook steak and apply BBQ sauce the taste is heavy, but if you put only lemon juice, the taste is light and refreshing. You can say the same in like drinks, ect..

For what it's worth, sappari wakarimasen means "I don't understand AT ALL".

To fully understand "sappari" you have to realize that a word has a "denotation" and a "connotation," and when going from one language to another cultural factors can cause a split between the two. Denotatively, "sappari" means "tasteless and bland." But connotatively, in English we would interpret that negatively, while in Japanese, lack of any significant stimulation of any sort is a positive. So the full correct translation might be "This is tasteless and bland, and I like it!"