How many letters does the top answer for “the quality or state of being subjective; character of the subject.” have?

The most common answer is subjectivity (12 letters).

Crossword clue: the quality or state of being subjective; character of the subject.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

subjectivity 12 letters web-def

judgment based on individual personal impressions and feelings and opinions rather than external facts

quality of being subject. 50% similar → subjectness

the quality of being subjective 50% similar → subjectivism