people, or a group of people, regarded as disreputable or worthless

a pack of riffraff.

the lowest classes; rabble

the riffraff of the city.

trash; rubbish.

worthless, disreputable, or trashy.

noun

commonality , commoners , dregs of society * , gang , gathering , hoi polloi , lower class , mob , one-percenters , outcast , rank and file , ring , scum , trash , undesirables , vermin , dreg , lumpenproletariat , rabble , ragtag and bobtail , dregs , garbage , masses , refuse , rubbish