incapacity (n.) Look up incapacity at Dictionary.com
1610s, "lack of ability, powerlessness," from French incapacité (16c.), from Medieval Latin incapacitatem (nominative incapacitas), from Late Latin incapax (genitive incapacis) "incapable," from in- "not" (see in- (1)) + Latin capax "capable," literally "able to hold much," from capere "to take," from PIE root *kap- "to grasp" (see capable). As a legal term (1640s), "lack of qualification," referring to inability to take, receive, or deal with in some way.