Denshi Jisho — Online Japanese dictionary

内密 ないみつ privacy; secrecy
Na-adjective, Noun, No-adjective 
内密 ないみつに confidentially; privately; off the record
Adverb 

You can also

Look up kanji details for 内密.

Try a Yahoo Jisho search for 内密 .
Try a Goo Jisho search for 内密 .
Try a Google search for 内密 .