IPA: /ɪɡˈnɔːrəntnəs/
KK: /ɪgˈnɔrəntnəs/
The state of being uninformed or lacking knowledge about something.
His ignorantness about the topic led to many misunderstandings.
Ignorantness is formed from "ignorant" (from Latin "ignorans", meaning not knowing) and the suffix "-ness" (meaning the state or quality of). The word refers to the state of being uninformed or lacking knowledge.
Think of 'not knowing' ('ignorant') and how adding '-ness' indicates a state. This helps you remember that 'ignorantness' means the state of being uninformed.