The best replacement for impossible is improbable.

The best alternatives to impossible are rated as following:
★★★★★  improbable
★★★★  possible
★★★  impossible
★★★  not possible
★★★  implausible
★★★  kitchen nightmares
★★  james bond
★  i\u0027m possible
★  360 shuvit
★  unpossible
★  classic xcom
★  bourne
★  sherlock holmes
★  may be possible
★  nearly impossible
★  007
  impossible is nothing
  nearly

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Speaking about impossible, one probably shouldn't forget about me series.

Other search terms related to impossible and their ratings are:
★★★★★ me series
★ nothing
★ god verse
god scripture
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