weakened by old age; feeble; infirm: a decrepit man who can hardly walk.
2.
worn out by long use; dilapidated: a decrepit stove.
Origin: 1400–50; late Middle English < Latin dēcrepitus, literally, broken down, equivalent to dē-de- + crep(āre) to crack + -i--i- + -tus past participle suffix