IPA: /ˈdʒɛntəlˌpɜːrsən/
KK: /ˈdʒɛntəlˌpɜrsən/
A person who is polite, well-mannered, and often comes from a good social background; can refer to either a man or a woman.
The gentleperson offered their seat to the elderly lady on the bus.
Gentleperson is formed from "gentle" (from Old French *gentil*, meaning noble or well-born) and "person" (from Latin *persona*, meaning a character or individual). The word describes a person of noble birth or refined manners.
Think of someone who is 'noble' ('gentil') and a 'character' ('persona') — a gentleperson is someone who embodies these qualities.
No commonly confused words.