Definition of heretical
1
: of or relating to adherence to a religious opinion contrary to church dogma : characterized by heresy
heretical writings
2
: of, relating to, or characterized by departure from accepted beliefs or standards : unorthodox
It would be heretical to suggest changing company policy.
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Merriam-Webster unabridged
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Time Traveler for heretical
The first known use of heretical was in the 15th century
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