infra dig.

word-forming element meaning "below, beneath," from Latin infra (adverb and preposition) "below, underneath, on the under side, beneath," also "later than; smaller than; inferior to," related to infernus "low, below," from PIE *ndher "under" (source also of Sanskrit adnah "below," Old English under "under, among;" see under). Modern popular use of it dates from the 1920s, as an opposite to super-, often in science fiction. "This use of infra- is scarcely a Latin one" [OED].

c. 1200, "state of being worthy," from Old French dignite "dignity, privilege, honor," from Latin dignitatem (nominative dignitas) "worthiness," from dignus "worth (n.), worthy, proper, fitting," from PIE *dek-no-, suffixed form of root *dek- "to take, accept."

From c. 1300 as "an elevated office, civil or ecclesiastical," also "honorable place or elevated rank." From late 14c. as "gravity of countenance."