atavistic
Pronunciation:
/æt.əˈvɪs.tɪk//æt.əˈvɪs.tɪk/adjective
Definitions
Of the recurrence of a trait reappearing after an absence of one or more generations due to a chance recombination of genes.
Of a throwback or exhibiting primitivism.
Relating to earlier, more primitive behavior that returns after an absence.