reptilious

Etymology
From, replacing earlier adjectival  and.

Adjective

 * : creeping, crawling.
 * 1) * 1771, William Pardon & al., A New General English Dictionary, 14th ed., s.v. "Reptilious":
 * Reptilious, creeping, crawling, swarming upon the belly, etc.
 * : reptilelike, of or related to members of the class.