YOU SAID:
School is the most boring thing to exist
INTO JAPANESE
学校は存在するのが最も退屈なことです
BACK INTO ENGLISH
School is the most dull thing to exist
INTO JAPANESE
学校は存在するのが最も鈍いものです
BACK INTO ENGLISH
School is the slowest to exist
INTO JAPANESE
学校は存在するのが最も遅い
BACK INTO ENGLISH
School is the slowest to exist
That didn't even make that much sense in English.