unstimulating

adjective

un·​stim·​u·​lat·​ing ˌən-ˈstim-yə-ˌlā-tiŋ 

: not producing stimulation : not stimulating

… football attracts viewers hoping to get a taste of aggression in their otherwise unstimulating lives.

—Nicholas Keating

Word History

First Known Use

circa 1796, in the meaning defined above