Denshi Jisho — Online Japanese dictionary

失礼 しつれい 1: discourtesy; impoliteness;
2: (Expression) Excuse me; Goodbye;
3: (Suru verb) to leave;
4: to be rude
Common word, Noun, Suru verb, Na-adjective 
失礼至極 しつれいしごく extremely rude (impertinent, impolite)
Na-adjective 
失礼します しつれいします excuse me
Noun 
失礼千万 しつれいせんばん extremely rude (impertinent, impolite)
Na-adjective 
失礼しました しつれいしました excuse me; I'm sorry
Noun 

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