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.
Husband (noun) the male head of a household; one who orders the economy of a family. Husband (noun) a cultivator; a tiller; a husbandman. Husband (noun) one who manages or directs with prudence and economy; a frugal person; an economist. Husband (noun) a married man; a man who has a wife; -- the correlative to wife. Husband (noun) the male of a pair of animals