悩み【なやみ】
trouble, troubles, worry, distress, sorrows, anguish, agony, problem
苦悩【くのう】
(mental) agony, anguish, suffering, distress
悩ます【なやます】
to afflict, to torment, to harass, to molest
悩む【なやむ】
to be worried, to be troubled
伸び悩む【のびなやむ】
to be sluggish, to make little progress, to show little growth, to fail to improve, to level off, to not grow as much as expected
煩悩【ぼんのう】
worldly desires, evil passions, appetites of the flesh, klesha (polluting thoughts such as greed, hatred and delusion, which result in suffering)