Unthinking, low, base, contemptible.
Reptilelike.
Of or relating to the members of the class Reptilia.
Cold-blooded, treacherous, unavoidably selfish and hostile.
A reptilian person, especially (ethnic slur) a Jew.
A reptilian animal: a reptile.
A reptilian alien, especially (ufology, often capitalized) of a shapeshifting race purported to secretly control the world.
Not noble; ignoble; base.
Of a metal, being at the lower end of the electrochemical series, i.e. oxidising readily.
To make (someone or something) no longer noble