Decrepit :: Decrepit (a.) Broken down with age; wasted and enfeebled by the infirmities of old age; feeble; worn out.
Decrepitate :: Decrepitate (v. t.) To roast or calcine so as to cause a crackling noise; as, to decrepitate salt..
Decrepitation :: Decrepitation (n.) The act of decrepitating; a crackling noise, such as salt makes when roasting..
Decrepitude :: Decrepitude (n.) The broken state produced by decay and the infirmities of age; infirm old age.