-decadian 

Suffix used to describe something of a particular decade. Used with a Latin-numberical prefix. For example, to refer to something of the 70s, one would say "Septadecadian", the 80s "Octadecadian" and so forth.

The locals in Kansas have an octadecadian sense of fashion.

-decadian by Ted Lynn Smith August 8, 2003

decadial 

decadial means diabolical with more oomph

Jayson replied with "decadial stutter"

decadial by geeked in calabasas March 16, 2025