faithlessly

So little faith did Kyle MacLachlan have that the show would be a hit, he faithlessly signed a five-year contract before shooting the pilot, as did the rest of the cast.

On a Wednesday in late March, about a dozen people showed up to faithlessly imbibe, and all but one were white.

To deliver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly; as, an officer betrayed the city.

How far would they follow, these faithlessly faithful wanderers of the sea?

Thy lap fain would I rest upon, Though faithlessly from thee I fled Still thy chains draw thy wand'ring son Oh! mother, back where'er his feet may tread.