Nantoka/苦苦kǔ kǔ苦苦 (kǔ kǔ) is a Chinese word meaning “strenuously; persistently; hard”.Meanings1strenuously2persistently3hard4painfulCharacters in 苦苦苦kǔ · bitter苦kǔ · bitterRelated words痛苦pain辛苦exhausting苦bitter艰苦difficult受苦to suffer hardship苦难suffering苦恼vexed挖苦to speak sarcastically苦头sufferings刻苦hardworking苦衷secret trouble苦力bitter workStudy Chinese with flashcards →