Denshi Jisho — Online Japanese dictionary

1: pain; anguish; suffering; distress; anxiety; worry; trouble; difficulty; hardship;
2: (Buddhist term) duhkha (suffering)
Noun 
くど this painful world; magnesia
Noun 
くみ bitterness; bitter taste
Noun, No-adjective 
くみ bitterness; bitter taste
Noun, No-adjective 
こそ kousso (African flowering plant, Hagenia abyssinica); kosso; cusso; koso; brayera
Noun, Usually written using kana alone 
しく the four kinds of suffering (birth, old age, disease, death)
Noun, Buddhist term 
しく 1: (Buddhist term) inevitability of death (one of the four kinds of suffering);
2: death pains; agony of death
Noun 
りく agony of separation
Noun 
くげん candid (frank) advice; exhortation
Common word, Noun, No-adjective 
くしん pain; trouble; anxiety; diligence; hard work
Common word, Noun, Suru verb 
くせん hard fight; close game
Common word, Noun, Suru verb 
くつう pain; agony; bitterness
Common word, Na-adjective, Noun, No-adjective 
くなん suffering; distress; hardship; trial
Common word, Noun 
くのう suffering; distress; affliction; anguish; agony; trouble
Common word, Noun, Suru verb 
くりょ rack one's brains
Common word, Noun, Suru verb 
くろう troubles; hardships
Common word, Na-adjective, Noun, Suru verb 
しんく hardship; toil; trouble
Common word, Noun, Suru verb 
にがい bitter
Common word, Adjective 
にがて 1: poor (at); weak (in); not very good (at);
2: dislike (of)
Common word, Na-adjective, Noun 
にがみ bitterness; bitter taste
Common word, Noun, No-adjective 
かんく sweetness and bitterness; joys and sorrows
Noun 
かんく privation suffering
Noun, Suru verb 
きんく toil and hardship
Noun, Suru verb 
くえき hard toil
Noun, No-adjective 
くかん coldest time of the year; bitter suffering
Noun 
くがい 1: (Buddhist term) world of suffering;
2: life of prostitution
Noun 
くがく paying one's own school expenses by working
Noun, Suru verb 

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