traitorously
Adverb
Meaning
in a disloyal and faithless manner
Source: WordNetSynonyms
Antonyms
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Thou hast most traitorously corrupted the youth of the realm in erecting a grammar-school; and whereas, before, our forefathers had no other books but the score and the tally, thou hast caused printing to be used; and, contrary to the king, his crown, and dignity, thou hast built a paper-mill.
Thou hast most traitorously corrupted the youth of the realm in erecting a grammar school.
he behaved treacherously
his wife played him false