Testudinate is an unusual word that means "like a tortoise" or "having characteristics of a tortoise." Some synonyms for testudinate include sluggish, lethargic, slow-moving, and ponderous. Other synonyms might include turtle-like, plodding, and hulking. These words all suggest a slow and steady pace, as well as a certain bulkiness or heaviness. Testudinate might be used to describe an animal that moves slowly, such as a tortoise or a snail, or a person who is slow to react or make decisions. In any case, the word connotes a certain slowness and deliberateness that can be both powerful and frustrating depending on the context.