(a.) Covered with scum; of the nature of scum.

abject abominable arrant atrocious barfy base beggarly beneath contempt cheap cheesy common contemptible crappy crummy debased degraded depraved despicable dirty disgusting execrable fecal feculent fetid filmy filthy flagrant flyblown foliaceous foliated foul fulsome gaudy gimcracky gloppy grave gross gunky heinous icky in layers lamellar lamellate lamellated lamelliform laminate laminated laminous leaflike leafy little low low-down lumpen maggoty malodorous mangy mean measly membranous mephitic meretricious miserable monstrous mucky nasty nauseating nefarious obnoxious odious ordurous paltry pathetic petty pitiable pitiful poky poor puky putrid rank reptilian repulsive rotten rubbishy sad scabby scrubby scruffy scurfy scurvy scuzzy shabby shitty shoddy slabby slimy sloppy sloshy sludgy slushy small sorry spathic spathose sposhy squalid stratified stratiform three-ply trashy trumpery two-for-a-cent two-for-a-penny two-ply twopenny twopenny-halfpenny unmentionable valueless vile vomity wormy worthless wretched yecchy