FRAIL

[adjective] -er, -est - weak or unhealthy, or easily damaged, broken or harmedI last saw him just last week and thought how old and frail he looked.At 85, Doris, single, diabetic and living alone, was becoming increasingly forgetful and frail.He seems unconcerned by the damage that has been done to the country's economy and to its frail democracy.The evidence against him is too frail for a successful prosecution.