倦怠 （ケンタイ） weariness, fatigue, languor, boredom, tedium, ennui

倦厭 （ケンエン） weariness

飽きる （あきる） to get tired of, to lose interest in, to be fed up with, to have enough

倦む （あぐむ） to get tired of (doing), to lose interest in

倦ねる （あぐねる） to tire of, to lose interest in, to be too much for one, to find unmanageable, to be beyond one's control, to not know what to do with

倦む （あぐむ） to get tired of (doing), to lose interest in