きつい (translations)→ arduous baleful bitter broad corrosive demanding explicit fierce good grave hard nasty palpable sharp sharply sharpness shattering steep strong stubborn tightly tough
つらい (translations)→ affliction bad difficult discomfort grin harrowing heart-rending lousy pain rough sad terror troubled trying uncomfortable worse
苦しい (translations)→ agonized agonizing agony choked hurt ordeal painfully sick sorrow stciky suffer suffering thorny tight unpleasant worry
苦痛 (translations)→ penance stab taste travail
実に (translations)→ actually always apparently awful best damn deep exceedingly great perfectly quite rather real really so sure surprisingly truly unbridled very
辛い (translations)→ acrimonious bother cruel miss piquant sorry spicy taxing unbearable
切ない (translations)→ melancholy oppressive touching
痛ましい (translations)→ pathetic piteous
無理な (translations)→ absurd impossible unreasonable
容易ならぬ (translations)→ dearly formidable