Japanese calls “Aku”, “Waru”. It’s old Kanji character. In a general sense, it is the opposite or lack of good. It can be a very broad concept, but in everyday use it often expresses deep wickedness in a narrower range. > One letter Kanji stock あくわる 漢字
Japanese calls Fu or Tsu at old. Usually they calls Zu-Tsu. pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs > one letter kanji stock ずつう 漢字
Japanese calls Doku. any substance that causes injury or illness or death of a living organism. > a letter Kanji stocks どく 漢字