Disbelief or uncertainty (about something); (countable) a particular instance of such disbelief or uncertainty.
To be undecided about; to lack confidence in; to disbelieve, to question.
Accuracy, or exact correspondence to some given quality or fact.
Faithfulness to one's duties.
Loyalty to one's spouse or partner, including abstention from cheating or extramarital affairs.
The degree to which a system accurately reproduces an input.