YOU SAID:
Only bad thing is fun.
INTO JAPANESE
悪いのは楽しいだけです。
BACK INTO ENGLISH
Bad is just fun.
INTO JAPANESE
悪いことはただの楽しみです。
BACK INTO ENGLISH
Bad things are just fun.
INTO JAPANESE
悪いことはただ楽しいです。
BACK INTO ENGLISH
Bad things are just fun.
That didn't even make that much sense in English.