in·ca·pac·i·ty /ˌin-kə-'pa-sə-tē/ n pl -ties
1: the quality or state of being incapable; esp: lack of legal qualifications due to age or mental condition compare capacity
2: the inability of an injured worker to perform the duties required in a job for which he or she is qualified compare disability 1
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.