How many letters does the top answer for “a personal belief or judgment that is not founded on proof or certainty” have?

The most common answer is opinion (7 letters).

Crossword clue: a personal belief or judgment that is not founded on proof or certainty

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

opinion 7 letters wn-def

a personal belief or judgment that is not founded on proof or certainty

persuasion 10 letters wn-def

a personal belief or judgment that is not founded on proof or certainty