Antonyms of deception :
candor, frankness, honesty, simplicity, truth, fair dealing, guilelessness, openness, sincerity, veracity, candidness, directness, plainness, plainspokenness, probity, dependability, reliability, reliableness, solidity, trustability, trustiness, trustworthiness, decency, goodness, incorruptibility, integrity, righteousness, truthfulness, uprightness, virtuousness, artlessness, forthrightness, good faith, ingenuousness.
Examples of usage:
Duvernois had not a friend intelligent enough to say to him, " You must love your wife; if you cannot love her, you must with merciful deception make her believe that you do. "Not Pretty, But Precious", John Hay, et al..
That you get angry with this or that person, is of little importance if it is a comfort to you; but that you remain furious, indignant for weeks, months, almost years, is unjust and cruel to those who love you, and who would like to spare you all anxiety and all deception. "The George Sand-Gustave Flaubert Letters", George Sand, Gustave Flaubert Translated by A.L. McKensie.
Many of the masters in turn practice deception to prevent the apprentices from buying themselves, or to make them pay the very highest sum for their freedom. "The Anti-Slavery Examiner, Omnibus", American Anti-Slavery Society.