[bù mǎn]

be discontented with one's circumstances
对处境不满

nurse a grievance
心怀不满

abate discontent
缓和不满情绪

stir up discontent with sb.
煽动对某人的不满

Lack of food and supplies caused disaffection among the soldiers.
食物和补给的不足造成士兵的不满。

Disaffection broke out almost from the start.
几乎一开头就爆发出不满情绪。