Denshi Jisho — Online Japanese dictionary

無実 むじつ 1: absence of the fact; insubstantiality; innocence; guiltlessness;
2: (No-adjective) innocent; guiltless;
3: false; untrue
Common word, Noun 
無実の罪 むじつのつみ a false charge
Noun 

You can also

Look up kanji details for 無実.

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