Definitions

1. adjective

below or beneath the earth; subterranean

“The submundane tunnels were hidden from view by the dense foliage.”

2. adjective

relating to or characteristic of the underworld or the dead

“The submundane themes in the novel added to its sense of mystery and intrigue.”

3. noun

something that is subterranean or relates to the underworld

“The discovery of the submundane structures led to a new understanding of the region’s history.”