Adjective
The word is derived from grumpy
I'm getting grumpier all the time. Ned Beatty
I thought it was referencing a "Grumpier Old Men"/Burgess Meredith quote. Source: Internet
Over the years, Loren has appeared in fewer movies, most notably Robert Altman’s "Ready to Wear," “Grumpier Old Men” and the recent feature adaptation of the musical “Nine.” Source: Internet