The antonym for "have signs of" is "show no indication of." When something shows no indication of an issue or problem, it means that there are no visible or observable symptoms or characteristics. This can apply to physical, emotional, or behavioral traits. For example, if a person shows no indication of stress, it means that they do not display any physical or emotional signs of stress, such as sweating, fidgeting, or anxiety. Similarly, if a computer shows no indication of a virus, it means that there are no discernible symptoms, such as slow performance or unusual pop-ups. In contrast, if something has signs of a problem, it means that there are clear and visible indications or symptoms that suggest an issue that needs to be addressed.