TREACHEROUS, a. trech'erous. See Treachery. Violating allegiance of faith pledged faithless traitorous to the state or sovereign perfidious in private life betraying a trust. A man may be treacherous to his country, or treacherous to his friend, by violating his engagements or his faith pledged.
The King James Bible has stood its ground for nearly 400 years. However, during that time the English language has changed, and with it the meanings of some words it used. Here are more than 6,500 words whose definitions have changed since 1611.Wikipedia
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