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Webster 1913 Edition

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Opposed to monarchial government.

Bp. Benson. Addison.

Adj.

[anti, against and monarchical.]

Opposed to monarchy; that opposes a kingly government.

antimonarchical ‎(comparative more antimonarchical, superlative most antimonarchical)

(politics) Opposing a particular monarchy.
(politics) Opposing the concept of monarchy, rule by a single person.
Antimonarchical sentiment threatened to sweep away the last vestige of royal prerogative.

antimonarchic — see antimonarchic