Opposite words for contentment :
sorrow, agitation, discontentedness, woe, disturbance, depression, despondency, anger, annoyance, discontentment, anguish, unhappiness, dispiritedness, discontent, rage, exasperation, irritation, desolation, melancholy, misery, discomfort, dejection, uneasiness, aggravation, joylessness, displeasure, vexation, sadness, gloom, dissatisfaction, distress, restlessness, fury, wretchedness, upset, pique.
He saw an expression of surprise, of anxiety, then a smile of deep contentment. "The Nether World", George Gissing.
She could,- she thought that she could, have watched her child's happiness with contentment had Clara married Owen Fitzgerald- Sir Owen, as he would then have been. "Castle Richmond", Anthony Trollope.
The latter, as the hour for the entrance of Belisarius approached, prepared to don his royal garments- with great contentment, for it was the last time that he would ever wear the signs of a dignity which had brought him nothing but pain and wretchedness. "A Struggle for Rome, Vol. 2 (of 3)", Felix Dahn.
But there was a nervousness in his contentment which told the tale to any observer who might know how to read it. "Can You Forgive Her?", Anthony Trollope.