He is a soldier, and, like Adeimantus, has been distinguished at the battle of Megara (anno 456 ?)...The character of Adeimantus is deeper and graver, and the profounder objections are commonly put into his mouth.

Glaucon is more demonstrative, and generally opens the game.

Adeimantus pursues the argument further.

Glaucon has more of the liveliness and quick sympathy of youth; Adeimantus has the maturer judgment of a grown-up man of the world.

In the second book, when Glaucon insists that justice and injustice shall be considered without regard to their consequences, Adeimantus remarks that they are regarded by mankind in general only for the sake of their consequences; and in a similar vein of reflection he urges at the beginning of the fourth book that Socrates fails in making his citizens happy, and is answered that happiness is not the first but the second thing, not the direct aim but the indirect consequence of the good government of a State.