Denshi Jisho — Online Japanese dictionary

密か ひそか secret; private; surreptitious
Common word, Na-adjective, Noun 
秘か ひそか secret; private; surreptitious
Na-adjective, Noun 
窃か ひそか secret; private; surreptitious
Na-adjective, Noun 
窃盗 せっとう theft; stealing; larceny
Common word, Noun, Suru verb, No-adjective 
窃取 せっしゅ theft; stealing; larceny
Noun, Suru verb 
窃用 せつよう using without permission; using information obtained in the course of one's duties
Noun, Suru verb, Obscure term 
密事 ひそかごと 1: (Archaism) secret; private matter;
2: amorous affair; liaison
Noun 
密か事 ひそかごと 1: (Archaism) secret; private matter;
2: amorous affair; liaison
Noun 
窃ちゃり せっちゃり bicycle theft
Noun 
窃盗罪 せっとうざい theft; stealing; larceny
Noun 
窃盗団 せっとうだん group of thieves
Noun 
窃盗犯 せっとうはん theft; stealing; larceny
Noun 
窃盗狂 せっとうきょう kleptomaniac
Noun 
窃盗行為 せっとうこうい theft; act of larceny
Noun 

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