extreme or excessive inflation.

1925–30; hyper- + inflation

hyperinflationary, adjective
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World English Dictionary
hyperinflation (ˌhaɪpəɪnˈfleɪʃən)
Also called: galloping inflation extremely high inflation, usually over 50 per cent per month, often involving social disorder

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Example sentences
Yet some economists and investors insist high inflation, even hyperinflation,
  is lurking in the wings.
It is also stuffed full of durable companies that have survived hyperinflation
  and two world wars.
The only alternative to a deflationary squeeze would be a burst of central bank
  money printing leading to hyperinflation.
One quick note: none of this means that hyperinflation is around the corner.
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