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.
A gay bouquet of flowers. The definition of gay is someone or something bright or happy. An example of gay is a bouquet of flowers with many brilliant colors. Gay means a homosexual person. An example of gay is a man who is only attracted to other men.