Ultra
Part of speech: adjective
Definition: Extreme; far beyond the norm.
Part of speech: noun
Definition: An extremist. Code name used by British codebreakers during World War 2 for decrypted information gained from the enemy.
Extremist
Part of speech: adjective
Definition: holding extreme views, especially on a political subjectof, or relating to extremism
Part of speech: noun
Definition: a person who holds extreme views, especially one who advocates such views; a radical or fanatic
Example sentence: War on terrorism defines the central preoccupation of the United States in the world today, and it does reflect in my view a rather narrow and extremist vision of foreign policy of the world's first superpower, of a great democracy, with genuinely idealistic traditions.