infraordinary
Existing at a level below that which is considered ordinary.
literary
There is richness in every verse, with ever now and then a bit of imagery that must inevitably stamp itself upon even an infraordinary intelligence.
Where it comes from
From infra- + ordinary. Now mainly used as an allusion to the writings of French novelist, filmmaker, documentalist, and essayist Georges Perec, who used the term l'infra-ordinaire in his 1973 essay "Approaches to What?" (Approches de quoi ?). First attested in 1827.
Adapted from the Wiktionary entry infraordinary (CC BY-SA 4.0).