SIQ is a medical term that stands for "sick in quarters", typically used in military settings to indicate that an individual is too ill to perform their duties and must be confined to a particular space. Synonyms for SIQ include "bedridden", "incapacitated", "invalid", "sickly", "unwell", "indisposed", "ailing", "afflicted", "ailing", "diseased", "sickening", "pallid", "feverish", "weak", "ill-fated", "under the weather" and "laid up". These words all convey the idea of someone suffering from some kind of illness or injury, and incapable of functioning as normal. It is important to use appropriate synonyms when describing someone's medical status in order to avoid any confusion or miscommunication.