Adam Clarke on Titus 1:7

Not self-willed - Μη αυθαδη· Not one who is determined to have his own way in every thing; setting up his own judgment to that of all others; expecting all to pay homage to his understanding. Such a governor in the Church of God can do little good, and may do much mischief.

Not soon angry - Μη οργιλον· Not a choleric man; one who is irritable; who is apt to be inflamed on every opposition; one who has not proper command over his own temper.