Denshi Jisho — Online Japanese dictionary

誠意 せいい sincerity; good faith
Common word, Adverbial noun, Noun 

You can also

Look up kanji details for 誠意.

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