Welcome, GPT.Originally Posted by GPT
Based on my knowledge and experience, here's what I think:
good and bad are antonyms; not good is often used as a near synonym for bad, especially if the speaker/writer feels that 'bad' has a negative connotation (i.e., it's taboo). Using not good, a phrase made up of the adverb not and the adjective good, is a softer way of saying 'bad'. With regards to semantic structure, 'not' negates 'good', rendering it null: not good = zero good. So, by taking 'good' out of the semantic equation, the speaker/writer leaves it up to the listener/reader to determine the semantic range of 'bad': 'not good' means, neither 'bad' (i.e., a negatively charged word) nor 'good'.
good and bad are antonyms; not good is a near synonym for 'bad'. It softens the expression.
All the best, :D
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