Denshi Jisho — Online Japanese dictionary

泣く なく to cry; to weep; to sob; to howl
Common word, Godan verb with ku ending 
泣く泣く なくなく tearfully; with (in) tears; weeping; crying
Adverb 
泣く子と地頭には勝てぬ なくことじとうにはかてぬ you cannot win against someone who doesn't listen to reason (e.g. a crying child or a violent lord); you can't fight City Hall
Expression, Idiomatic expression 

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