Ignorance

google

ref

Middle English: via Old French from Latin ignorantia, from ignorant- ‘not knowing’ (see ignorant).

wiktionary

ref

From Middle English ignoraunce, ignorance, from Old French ignorance, from Latin ignōrantia. By surface analysis, ignore +‎ -ance.

etymonline

ref

ignorance (n.)

c. 1200, "lack of wisdom or knowledge," from Old French ignorance (12c.), from Latin ignorantia "want of knowledge" (see ignorant). Ignoration (1832) has been used in the sense "act of ignoring." The proverb, in the form "Where ignorance is bliss, 'tis folly to be wise", is from Gray's "Ode on a Distant Prospect of Eton College" (1742) .