[n] the feeling of being bored by something tedious
ennui, tedium
acedia, aloofness, angst, anguish, anxiety, apathy, boredness, carelessness, cheerlessness, detachment, discomfort, discomposure, discontent, disgust, disinterest, disinterestedness, dislike, dispiritedness, displeasure, disquiet, dissatisfaction, distast