μηδενί δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement on anything until you have heard a speech on both sides
P. σκληρότης, ἡ, χαλεπότης, ἡ.
obstinacy: P. αὐθάδεια, ἡ, Ar. and V. αὐθαδία, ἡ.