Going to great lengths; opposed to moderate. Of actions, measures, etc.: Severe or violent in the utmost degree, or in an exceedingly great degree…

Having or characterized by lofty ideals or aims; ambitious, aspirational; grandiose; (later also) highly successful, esp. in one's career.

Extravagant or ‘wild’ in speculation. Obsolete.

Going beyond what is usual or ordinary; excessive, extreme, immoderate.

Violently extreme.

tending to extremes in opinion or practice.