Gentleman ˈdʒentlmən Man Noun Acted True You—You're Real

• you acted like a true gentleman.
• thank you—you're a real gentleman.
• he was always the perfect gentleman.
• he's no gentleman!

gentleman

1. a man who is polite and well educated, who has excellent manners and always behaves well
• COMPARE lady
  https://www.oxfordlearnersdictionaries.com/definition/english/lady
• You acted like a true gentleman.
• Thank you—you're a real gentleman.
• He was always the perfect gentleman.
• He's no gentleman!
• He was too much of a gentleman to ask them for any money.
2. used to address or refer to a man, especially somebody you do not know
• Ladies and gentlemen! Can I have your attention, please?
• She was talking to an elderly gentleman.
• Ladies and gentlemen of the jury!
• Can I help you, gentlemen?
• There's a gentleman to see you.
3. used to address or refer to a male member of a legislature, for example the House of Representatives
4. a man from a high social class, especially one who does not need to work
• He retired to his estate and lived the life of a country gentleman.
• a gentleman farmer (= one who owns a farm for pleasure, not as his main job)
5. a man/woman who does not have to work

Word Origin

• Middle English (in the sense ‘man of noble birth’): from gentle + man, translating Old French gentilz hom. In later use the term denoted ‘a man of a good family (especially one entitled to a coat of arms) but not of the nobility’.