| Noun | 1. | unai - a sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoottree sloth, sloth - any of several slow-moving arboreal mammals of South America and Central America; they hang from branches back downward and feed on leaves and fruits Choloepus, genus Choloepus - a genus of Megalonychidae consisting of the two-toed sloth |
| 2. | unai - relatively small fast-moving sloth with two long claws on each front foottree sloth, sloth - any of several slow-moving arboreal mammals of South America and Central America; they hang from branches back downward and feed on leaves and fruits Choloepus, genus Choloepus - a genus of Megalonychidae consisting of the two-toed sloth |