► 名詞礼儀  [れいぎ]    
meaning:  manner  rank: 1☆ あいつは礼儀というものを
知らない ⇨ He doesn’t know, have, manners
☆ 
一言断るのが礼儀だろう ⇨ The right thing to do is you tell him first
☆ 礼儀正しい
人 ⇨ A very polite person
More examples:- 何て礼儀知らずなやつだ ⇨ He has no manners. What a rude bastard
 - 最低限の礼儀は持って欲しい ⇨ I would like everybody to have the minimum courtesy
 - 最近の若い人は礼儀作法を全く知らない ⇨ Young people today don’t know, have, any manners
 - 彼は今時珍しく礼儀正しい若者だ ⇨ He is a rare polite young man for this day and age