Denshi Jisho — Online Japanese dictionary

口笛 くちぶえ whistle
Common word, Noun 
口紅 くちべに lipstick
Common word, Noun, No-adjective 
区長 くちょう ward headman
Common word, Noun 
口調 くちょう tone (e.g. of voice, etc.); (verbal) expression
Common word, Noun 
掘削 くっさく digging out; excavation
Common word, Noun, Suru verb 
屈折 くっせつ 1: bending; indentation;
2: refraction;
3: inflection;
4: warping (e.g. of opinion, reasoning, etc.); distortion
Common word, Noun, Suru verb 
屈託 くったく 1: worry; care; concern;
2: ennui; boredom
Common word, Noun, Suru verb 
靴下 くつした socks; sock; stockings; stocking
Common word, Noun 
寛ぐ くつろぐ to relax; to feel at home
Common word, Godan verb with gu ending, Usually written using kana alone 
国柄 くにがら national character; regional character
Common word, Noun 
国々 くにぐに countries
Common word, Noun 
国人 くにびと indigenous person; inhabitant of a country
Common word, Noun 
組合 くみあい association; union
Common word, Noun 
倉敷 くらしき storage charges
Common word, Noun 
暗闇 くらやみ darkness; the dark
Common word, Noun 
繰入 くりいれ inward transfer (of money); carry over (money from previous period)
Common word, Noun 
玄人 くろうと 1: expert (professional) in a given trade or profession;
2: woman in the nightlife business; demimondaine
Common word, Noun, No-adjective 
黒潮 くろしお Japan Current; Kuroshio Current
Common word, Noun 
黒白 くろしろ black and white; right and wrong
Common word, Noun 
黒星 くろぼし 1: black spot; black dot; bull's-eye;
2: failure mark (sumo)
Common word, Noun 
黒幕 くろまく 1: black curtain;
2: wire puller; mastermind; political fixer; power broker
Common word, Noun, No-adjective 
桑原 くわばら mulberry field
Common word, Noun 
訓戒 くんかい warning; admonition; lesson or a phrase that teaches you not to do something
Common word, Noun, Suru verb 
君主 くんしゅ ruler; monarch; sovereign
Common word, Noun, No-adjective 
君臨 くんりん 1: reigning; controlling;
2: (Suru verb) to reign; to dictate; to control
Common word, Noun 
訓令 くんれい directive; instructions
Common word, Noun, Suru verb 

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