sloth UK /sləʊθ/US /slɔθ/noun 5verb 1forms 3 noun5 •Laziness; slowness of mind; disinclination to action or labour; a feeling combining indifference and lethargy; a dragging idleness.Hot summer days inspire a sense of sloth in me. •Any animal in the suborder Folivora. •Any member of species of the families Choloepodidae and Bradypodidae of herbivorous, arboreal South American mammals, noted for its slowness and inactivity. •Any of the extinct group of ground sloths. •(rare) A group of bears.One day there was a sloth of grizzly bears trying to catch salmon fish from the river — 2014 verb1 •To be idle; to idle (away time).He has been slothing this whole weekend. formsslothed · slothing · sloths