désœuvré « A healthy child cannot be idle; he has to be doing something all day. »« It is not his nature to be idle. »« idle bureaucrats who spend the day reading newspapers. » au chômage « many steel workers are idle. » au repos « 6 per cent of the country's factories were idle. » vain, futile, oiseux « He hasn't time for idle gossip. » bone idle = paresseux comme une couleuvre
to idle away one's time = passer son temps à ne rien faire.