1. to cause to lose physical fitness or conditioning through lack of exercise or training
Usage: often used in passive voice
2. to reverse or eliminate a conditioned response or learned behavior
Usage: psychology

Examples

• After months of bed rest, his muscles had become deconditioned.
• The athlete’s performance suffered because she had deconditioned during the off-season.
• Physical therapy helped recondition his deconditioned cardiovascular system.
• The therapist worked to decondition the patient’s fear response.
• Without regular practice, even professional musicians can become deconditioned.
• The study examined how quickly subjects could be deconditioned from their learned behaviors.