Generally, "not good" implies that it can be fixed or improved, or there is an alternative. Mary's spelling is not good. She always misspells words.
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Generally, "not good" implies that it can be fixed or improved, or there is an alternative.
Mary's spelling is not good. She always misspells words. (She can improve.)
This bread is not good. Let's buy a different brand next time.
"No good" implies that it can't be fixed or improved. It must be discarded.
This fruit is no good. It is rotten.
The bread is no goo