The definition of an adjective is a part of speech that is used to describe a noun. Red, tall, better and fast are all examples of adjectives.
In modern parlance, a gentleman (from gentle + man, translating the Old French gentilz hom) is any man of good, courteous conduct. A gentleman may also simply be a polite term for any man, as in indications of gender-separated facilities, or as a sign of the speaker's own courtesy when addressing others. The modern female equivalent is lady.
It's not expensive tailoring, but something that comes from within, writes David Gandy. At my grandfather's funeral, someone referred to him as the definition of a gentleman. I would describe my father in the same way. Often, in print at least, a man is described as a gentlemen because of the way he looks - his suit and his demeanour. I have been in the fashion industry now for 13 years and I've had the privilege of meeting some of the most powerful men, not just in fashion, but in business, film, music and so on.