Turbid comes from Latin turbidus ('confused, muddy, disordered'), from turba ('turmoil, crowd, disorder'), from Ancient Greek tyrbe ('disorder, tumult'). The form is best read as a historical transfer or inheritance, with its older language material carrying the main semantic load. As an adjective, it carries the sense "cloudy or muddy from stirred-up sediment; confused or unclear", with the older formation still helping explain the modern use. Relevant historical forms include Latin turbidus, Latin turba, and Ancient Greek tyrbe. Derivative forms include turbidity, turbidly, turbidness; related words include disturb, perturb, turbulent, turmoil.