faithless
adj 5
Definitions
adj
1
Lacking faith; lacking belief in something.
"You're so faithless about pills," he said, "that I'm not going to give you any."
2
Not believing in God, religion, or a comparable ideology.
3
Unfaithful (said of people, towards their partners)
Menelaus, who fought to recover his faithless wife, has clearly rooted himself in Sparta for the remainder of his life […]
4
Not observant of promises or covenants.
5
Not true to allegiance, duty, or vows
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