Adverb
In a disinterested manner; without bias or prejudice.
Source: Webster's dictionaryI would not like to see a person who is sober, moderate, chaste and just say that there is no God. They would speak disinterestedly at least, but such a person is not to be found. Jean de La Bruyère
Have you seen them?" he asked. Arrow looked at him disinterestedly. Will frowned. Not talking, eh?" he said. "Maybe you're a little hoarse." He cackled breifly at his own wit. John Flanagan
he decided the case disinterestedly Source: Internet