Denshi Jisho — Online Japanese dictionary

苦労 くろう troubles; hardships
Common word, Na-adjective, Noun, Suru verb 
苦労 くろうにん worldly-wise man
Noun 
苦労 くろうしょう nervous temperament; worry habit; pessimistic nature
Na-adjective, Noun 
苦労し抜く くろうしぬく to go through all sorts of hardships
Godan verb with ku ending 

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