How many letters does the top answer for “marked by unjust severity or arbitrary behavior” have?

The most common answer is oppressive (10 letters).

Crossword clue: marked by unjust severity or arbitrary behavior

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

oppressive 10 letters wn-def

marked by unjust severity or arbitrary behavior

tyrannous 9 letters wn-def

marked by unjust severity or arbitrary behavior