I'm not sure about this but it seems to me that "not good" always has a firm negative connotation, i.e. it is equivalent to "bad", whereas "not bad" doesn't necessarily have a firm positive connotation; it can lean towards "decent" or even "mediocre".

For example if you found a dish to be mediocre/slightly above mediocre "not bad" would be a fitting description. But if you found it to be mediocre/slightly below mediocre "not good" seems to be too strongly negative to aptly describe it.

So my question is: is my interpretation correct? And if so, why is this the case, since I'd expect these two phrases to be symmetric, as in, direct opposites.

  • 2
    Related: litotes
    – Robusto
    Feb 26, 2021 at 3:12
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    Expecting patterns everywhere in the usages of the English language will soon leave one disillusioned. 'Wicked' now means 'excellent' in addition to its other senses. Why doesn't 'immoral'? Why are 'Jane is taller than I am' and 'Jane is taller than me' unremarkable nowadays, while 'Jane is taller than I' might lead some to consider the speaker affected or peculiar? May 13, 2021 at 11:12

2 Answers 2


You are correct. "Not good" always means "unacceptable" or, in the case of situations "worrying". In fact "not good" can come close to meaning "disasterous" when referring to situations. For instance

"Captain Smith, sir, we have struck an iceberg and the watertight bulkheads are being overtopped'". "Oh, that's not good".

On the other hand "not bad" on its own rarely means more than "acceptable" or "mediocre" unless it is spoken with a strongly rising inflection in which case it can mean "surprisingly good" or "much better than I was expecting". For example:

"How was the food in your cheap hotel?"

"Not bad, actually. I've had much worse in four star establishments"

Out of interest you should consider "it's alright" which always means "mediocre". This last one was included in the Beatles song Strawberry Fields where it was contrasted with "it's all wrong" giving the lines

"it's all wrong, that is to say I think I disagree"


"It's alright, that is to say I think it's not too bad".

That was very clever when it came out in the Sixties.

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    “Not bad” can, though, mean “terrific,” as it might if you’re commenting on your friend’s new Ferrari.
    – Xanne
    Feb 26, 2021 at 8:36
  • For me disastrous is so-spelled; disasterous is British? Or just a rare variant?
    – Xanne
    Feb 26, 2021 at 8:54
  • @Xanne Just a rare variant. so rare in fact that only people who make typing errors use it. Ooops!
    – BoldBen
    Feb 26, 2021 at 18:54
  • 'Is my interpretation correct?' is arguably ELL-level, and certainly needs basic research. 'And if so, why is this the case?' isn't addressed here. May 13, 2021 at 10:43

I would say that in American English, "not bad" can mean anything from "mediocre" to "very good", depending on inflection. In British English, "not bad" usually just means "good" or "very good" (so there's less of an asymmetry with "not good").

Interestingly, the American expression "not half bad" is generally more positive than "not bad", since it's more clearly perceived as deliberate understatement.

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    Hello, the klaus. The 'mediocre' lower-limit isn't that rare in the UK either. / I'm puzzled why you seem to claim that 'not half bad' originated in the US; 'It ain't half hot, mum' is almost certainly British in origin. // Note that OP asks the very difficult question '... why is there this asymmetry?' May 13, 2021 at 11:01
  • @EdwinAshworth A frame challenge is an acceptable way to answer ‘why’ questions (which I agree are often very difficult to answer).
    – Lawrence
    May 13, 2021 at 15:58
  • The 'really good' interpretation of 'not half bad', of course, led to the Muppets joke "Say that wasn't half bad". "No it was ALL bad".
    – BoldBen
    May 15, 2021 at 12:29

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