Entry
  1. Na-adjective (keiyodoshi), Noun

    serious; not joking; straight

    ColloquialAbbreviationsee 真面目see まじめ・1

    「・・・おい・・・おい、先生!」「え?・・・あ、ああ」「マジだいじょうぶ?休講にしたら?」
    "...Hey...Hey, teacher!" "Eh? Oh." "Are you really OK? Shouldn't you cancel the lesson?"

Also written マジまぢマヂ

Pitch on OJAD