Synonyms:
extremist, radical, ultra
Meaning: (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative"
Usage examples
Ultra romanticism was foreign to the nature and repulsive to the tastes of the refined, elegant Mendelssohn, yet in spite of himself its influence crept gently into his polished works.
Members 'in good and regular standing,' fellowshipped throughout Christendom except by a few anti-slavery churches generally despised as ultra and radical, reduce their fellow men to the condition of chattels, and by force keep them in that state of degradation.