reptilian
(zoology) Of or relating to the members of the class (class) (reptiles).
Reptilelike.
(figuratively) Unthinking, low, base, contemptible.
(figuratively) Cold-blooded, treacherous, unavoidably selfish and hostile.
A reptilian animal: a reptile.
(figuratively) A reptilian person, especially (racial slur) a Jew.
(science fiction) A reptilian alien, especially (capitalized) of a shapeshifting race alleged to secretly control the world.