Bad vs No good vs Poor

When to use each in English, with meaning, register, and examples.

Bad

Top 1,000 (very common)A1adjective

No good

InformalTop 3,000 (common)

Poor

Top 1,000 (very common)A1
 BadNo goodPoor
Pronunciation🇬🇧 /["/bæd/","/wɜːs/","/wɜːst/"]/🇺🇸 /["/bæd/","/wɜːrs/","/wɜːrst/"]/🇬🇧 //nəʊ ɡʊd//🇺🇸 //noʊ ɡʊd//🇬🇧 /["/pɔː(r)//pʊə(r)/"]/🇺🇸 /["/pʊr//pɔːr/"]/
Meaningnot good or harmfulNot acceptable or useful.Having little money or resources
ExampleThat was a bad performance by the team.This plan is no good; we need to rethink it.She is in a poor condition after the accident.
RegisterNeutralInformalNeutral
How commonTop 1,000 (very common)Top 3,000 (common)Top 1,000 (very common)
CEFR levelA1-A1
Part of speechadjective
Collocationsbe, look, sound, extremely, fairly, very, at, for, not half bad, be, look, sound, extremely, fairly, very, at, for, not half bad, be, look, sound, extremely, fairly, very, at, for, not half bad, be, look, smell, feel, extremely, fairly, very, about, be, look, sound, extremely, fairly, very, at, for, not half badno good at all, no good for something, feel no good, it's no good, no good reasonpoor health, poor quality, poor performance
Antonymsgood, excellent, positive-rich, wealthy, affluent
Common mistakesUsing 'bad' instead of 'badly' as an adverb: e.g., 'He performed bad' instead of 'He performed badly'., Confusing 'bad' with 'ill' when referring to health. 'Ill' is usually used in formal contexts., Saying 'more bad' instead of 'worse' for comparative form.Overusing it in formal writing or speech., 'No good' mistaken for 'not good', which is more common., Using it without context, making the meaning unclear.Confused with 'pore' (the skin opening), Using 'poor' as a noun (should use 'the poor'), Saying 'poorness', which is not standard
Usage notesUse 'bad' to describe something that is of poor quality or morally wrong. It's generally appropriate in everyday conversation but can be too informal in professional settings. In formal writing, consider alternatives such as 'unfavorable' or 'detrimental'.Typically used to express dissatisfaction or disapproval. It's informal and may not be suitable in formal settings.Use 'poor' to describe someone lacking money or in bad conditions. Avoid using it in formal reports where 'underprivileged' might be more suitable.

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Bad
No good
Poor

Frequently asked questions: Bad vs No good vs Poor

What's the difference between Bad, No good, and Poor?

Bad: not good or harmful No good: Not acceptable or useful. Poor: Having little money or resources

Can you show an example of each?

Bad: That was a bad performance by the team. No good: This plan is no good; we need to rethink it. Poor: She is in a poor condition after the accident.

Can I use Bad, No good, and Poor interchangeably?

Not always. Bad, No good, and Poor are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.