betrayal
1 deception, disloyalty, double-cross (informal) double-dealing, duplicity, falseness, perfidy, sell-out (informal) treachery, treason, trickery, unfaithfulness
2 blurting out, disclosure, divulgence, giving away, revelation, telling
Antonyms
1 allegiance, constancy, devotion, faithfulness, fealty, fidelity, loyalty, steadfastness, trustiness, trustworthiness
2 guarding, keeping, keeping secret, preserving, safeguarding