苦 - suffering, trial, worry

bitter

pain of sickness

absurd; unreasonable; nonsensical; preposterous; incoherent

thank you (for your hard work); I appreciate your efforts

nonsensical; unreasonable; absurd; unrealistic

bitterness; bitter taste

last resort; desperate measure taken under the pressure of necessity

bitter smile; wry smile; forced smile; strained laugh

suffering; distress; hardship; trial

pain; anguish; distress; suffering; hardship

(mental) agony; anguish; suffering; distress

heavy (feeling, etc.); gloomy (weather, etc.); oppressive (atmosphere, etc.); stifling; strained