IPA: /əˈnɒnɪməsnəs/
KK: /əˈnɑːnɪməsnəs/
The condition of not being identified or known by name.
The artist chose to work in a state of anonymousness to keep their identity secret.
Anonymousness → It is formed from "anonymus" (from Greek "anōnymos", meaning without a name) and the suffix "-ness" (meaning the state or quality of). The word "anonymousness" refers to the state of being without a name or identity.
Think of 'without a name' ('anōnymos') to remember that 'anonymousness' means the quality of not having a name.