testudinate \te-STOOD-in-ayt\ (adjective) - 1 : Slow-moving, like a turtle. 2 : Curved like the carapace (shell) of a turtle; vaulted.
(noun) - A turtle.
"Devon's testudinate progress on his term paper had a direct correlation to his access to the Internet, television and video games."
From Late Latin testudinatus, from Latin testudo (tortoise). Also testudinal or testudinarian