Show bad posture is a term used to describe someone who has poor posture. SLOUCH is a 6 letter word that is often used to describe someone with bad posture, as it implies a lack of uprightness and a tendency to slump or bend over. Show bad posture is a term used to describe someone who has an overall poor posture, which can be caused by a variety of factors such as muscle weakness, poor ergonomics, or even psychological issues.