A "complete gentleman" is someone who is polite, respectful, and well-mannered in all aspects of life. They treat others kindly and with consideration, showing good behavior and etiquette in various situations. Full definition
«Adeleke was a leader in every right, a formidable colleague, patriotic statesman, good family man and complete gentleman whose contributions to the development of the of Osun State in particular and the nation in general will never be forgotten», he added. (dailypost.ng)
«When I met Donald Trump, he was gracious, professional and a complete gentleman to me and EVERYONE in my presence,» reads the letter, which begins «TO WHOM IT MAY CONCERN.» (nbcnews.com)
She added that the president is «gracious, professional, and a complete gentleman.» (intouchweekly.com)