subjectiveness

Concise Oxford English Dictionary © 2008 Oxford University Press:
subjective/səbˈʤektɪv/

▶adjective

• 1 based on or influenced by personal feelings, tastes, or opinions.

• 2 dependent on the mind for existence.

• 3 Grammar relating to or denoting a case of nouns and pronouns used for the subject of a sentence.

– derivatives
subjectively adverb,
subjectiveness noun,
subjectivity noun.