とげのある (translations)→ gravelly gritty
むずかしい (translations)→ advanced bad critically heavy important nervous poorly problematic quizzical tight tough tricky
苦しい (translations)→ agonized agonizing agony choked hard hurt ordeal pain painful painfully sick sorrow stciky suffer suffering uncomfortable unpleasant worry
心を痛める (translations)→ annoy fear nurse torture
痛い (translations)→ sore threat vulnerable
複雑な (translations)→ byzantine complex complexity complicated convoluted difficult elaborate intricate involved labyrinthine mixed tortuous
厄介な (translations)→ delicate exhausting gruelling irksome onerous puzzling uphill