Symptoms are signs that indicate the presence of an illness or disease. When a person is asymptomatic, it means that they do not show any symptoms of a particular condition. Therefore, antonyms for asymptomatic could include words like symptomatic, indicative, obvious, visible, apparent, and perceptible. Symptomatic refers to a situation where an individual displays clear symptoms of an ailment or disorder. Indicative describes a situation where there is a clear indication of something being wrong by the presence of symptoms. Obvious refers to the clear and easily perceivable sign of something being wrong. Visible is characterized by being able to see a particular symptom while apparent refers to the symptom being easily recognizable. Lastly, perceptible describes symptoms that can be detected through the senses.