Antonyms of adj true_to

1 sense of true to

Sense 1
true to (predicate) -- (sexually faithful; "she was true to her significant other")

INDIRECT (VIA faithful) -> unfaithful -- (having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend; "her husband was unfaithful")

Similarity of adj true_to

1 sense of true to

Sense 1
true to (predicate) -- (sexually faithful; "she was true to her significant other")
       => faithful (vs. unfaithful) -- (not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend; "he remained faithful to his wife")