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Webster 1828 Edition

Adj.

Not agreeable to the Scriptures; not warranted by the authority of the word of God; as an unscriptural doctrine.

unscriptural ‎(comparative more unscriptural, superlative most unscriptural)

Not scriptural.
- 1698, Stephen Nye, An account of Mr. Firmin's religion
  The continuance of these unscriptural terms, without an exact application of them in sermons and catechisms, heathenizes all the common people, nay and great numbers of not unlearned persons.