[Haskell-beginners] Haskell described as a "rigid" language

[Daniel Fischer]

On Tuesday 18 May 2010 12:13:20, Colin Paul Adams wrote:
> >>>>> "Edgar" == edgar klerks <edgar.klerks at gmail.com> writes:
>
>     Edgar> Probably dumb question, but was it the difference between
>     Edgar> rigid and inflexible in this context (I am not native english
>     Edgar> speaker)?
>
>     Edgar> Google define gives me this:
>
>     Edgar> Rigid means:
>
>     Edgar>   * incapable of compromise or flexibility * inflexible:
>     Edgar> incapable of adapting or changing to meet circumstances; "a
>     Edgar> rigid disciplinarian"; "an inflexible law"; "an unbending
>     Edgar> will to dominate"
>
> Interesting. that's not what I would expect
>
> Wikipedia seems more on the ball to me.

Could you elaborate a bit, please?
Which articles in Wikipedia, for example (the disambiguation page for 
rigidity gives like explanations [excepting technical terms in 
mathematics], I haven't found an article for inflexible[ibility], the 
wiktionary definition is alike again)?

I thought rigid and inflexible are fairly closely related, though not 
synonyms. Google define seems to agree.