you can do this with other い adjectives
like 美味しい [おいしい] meaning "delicious" or "tasty"
美味しい食べ物 [おいしいたべもの] "delicious food" or "tasty food"
美味しくない食べ物 [おいしくないたべもの] "non-delicious food" or "non-tasty food"
though, it isn't necessarily *bad* food
think of a single scale of
-5 to 5
where 5 is delicious, and -5 is bad
美味しい would be a 5 or very close to 5
美味しくない would be somewhere between 0 and 5, but not too close to 5
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