sloth

Concise Oxford English Dictionary © 2008 Oxford University Press:
sloth /sləʊθ/

▶noun

• 1 reluctance to work or make an effort; laziness.

• 2 a slow-moving tropical American mammal that hangs upside down from branches using its long limbs and hooked claws. [Genera Bradypus (three-toed sloths) and Choloepus (two-toed sloths).]

– derivatives
slothful adjective,
slothfully adverb,
slothfulness noun.

– origin OE: from slow + -th2.