Not republican; contrary to the spirit of a republic(adjective)
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Use "unrepublican" in a sentence
""unrepublican" formalities and elegance of Washington's "Court," at his triumphal progresses through the country, and at the enormous one-man power as exhibited in the person of Hamilton."
"He opposes a president who represents an alien and unrepublican philosophy of state control and state planning, whereas I ... we represent the individual."
"The Queen may have not ventured inside the All England Club for 33 years, but this is still a deeply unrepublican niche, an island of obedient gentility."