sloth

Sloth is laziness or a lack of effort, or a slow-moving, tree-hanging mammal from Central and South America. (noun)

When you sit around on the couch all day and don't make any effort to be productive, this is an example of being a sloth.

See sloth in Webster's New World College Dictionary

noun

disinclination to work or exert oneself; indolence; laziness; idleness
Now Rare slowness; delay
1. any of a family (Bradypodidae) of slow-moving, tree-dwelling edentate mammals of tropical Central and South America that hang, back down, from branches and feed on fruits and vegetation, including a three-toed species (genus Bradypus) and a two-toed species (genus Choloepus)
2. any of various families of extinct, ground-dwelling edentate mammals

See sloth in American Heritage Dictionary 4

(slôth, slōth, slŏth)

noun

Aversion to work or exertion; laziness; indolence.
Any of various slow-moving, arboreal, edentate mammals of the family Bradypodidae of South and Central America, having long hooklike claws by which they hang upside down from tree branches and feeding on leaves, buds, and fruits, especially:
a. A member of the genus Bradypus, having three long-clawed toes on each forefoot. Also called ai¹, three-toed sloth.
b. A member of the genus Choloepus, having two toes on each forefoot. Also called two-toed sloth, unau.
A company of bears. See Synonyms at flock¹.