pen·i·tent:
function: adjective
etymology: Middle English, from Middle French, from Latin paenitent-, paenitens, from present participle of paenitEre to cause regret, feel regret, perhaps from paene almost Date: 14th century
: feeling or expressing humble or regretful pain or sorrow for sins or offenses

jack·ass
function: noun
Date: 1727
1 : DONKEY; especially : a male donkey
2 : a stupid person