† ˈacolaustObs. [? ad.Gr. ἀκόλαστ-ος unchastised, licentious.] One that revels in sensual pleasures (like the prodigal of the parable). 1633T. Adams Exp. 2 Pet. ii. 19 (1865) 547/1 The acolaust loathes the service of that churl, that allowed him no better diet than husks.