'Sullen' in the Bible

"When you fast, do not look sullen like the hypocrites, for they make their faces unattractive so that people will see them fasting. I tell you the truth, they have their reward.

Fathers, do not provoke or irritate or exasperate your children [with demands that are trivial or unreasonable or humiliating or abusive; nor by favoritism or indifference; treat them tenderly with lovingkindness], so they will not lose heart and become discouraged or unmotivated [with their spirits broken].