► 連体詞赤の  [あかの]  [contempt]    
meaning:  complete  rank: 3☆ 赤の
素人 ⇨ A complete amateur, novice
赤の  [あかの]  [
赤の他人]  [contempt]    
meaning:  complete  rank: 3☆ 
彼は赤の
他人だ ⇨ He’s a total stranger to me
More examples:- 信号が赤の時は交差点を渡ってはいけない ⇨ You cannot walk/drive across an intersection when the signal is red
 - 彼と私は今や赤の他人だ ⇨ He and I are total strangers at this point (although we used to be close)