YOU SAID:

i wonder how incredibly retarted this sentence can become

INTO JAPANESE

この文がどれほど信じられないほど遅れているのだろうか

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How incredibly late this sentence is

INTO JAPANESE

この文はどれほど信じられないほど遅い

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This sentence is incredibly slow

INTO JAPANESE

この文は信じられないほど遅い

BACK INTO ENGLISH

This sentence is incredibly slow