Denshi Jisho — Online Japanese dictionary

ウォッカ vodka
Common word, Noun, rus: 
ウクレレ ukulele
Common word, Noun 
うずうず sorely tempted; itching to do something
Common word, Noun, Adverb, Suru verb, Onomatopoeic or mimetic word 
うっかり carelessly; thoughtlessly; inadvertently
Common word, Adverb, Noun, Suru verb 
うとうと falling in a doze; dozing
Common word, Adverb, Noun, Suru verb, Adverb taking the 'to' particle, Onomatopoeic or mimetic word 
ウルトラ ultra
Common word, Noun 
うろうろ loiteringly; aimless wandering
Common word, Adverb, Noun, Suru verb, Onomatopoeic or mimetic word 
うんざり tedious; boring; being fed up with
Common word, Adverb, Noun, Suru verb 
ウーマン woman
Common word, Noun, No-adjective 
ウァギナ vagina
Noun, lat: 
ウィザー to wither
Suru verb 
ウィッカ Wicca
Noun 
ウィッグ wig
Noun 
ウィット wit
Noun 
ウィドウ widow
Noun 
ウィドー widow
Noun 
ウィリー wheelie
Noun 
ウィルム wyrm (variety of wyvern)
Noun 
ウィンク wink
Noun, Suru verb 
ウィング wing
Noun 
ウィンズ WINS
Noun, Computer terminology 
ウィンタ winter
Noun 
ウィンチ winch
Noun 
ウィード weed
Noun 
ウイグル Uighur (Turkic people and language in NW China); Uygur
Noun, Usually written using kana alone 
ウイスキ whisky; whiskey
Noun 

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