Definitions for "Extremist"
An all-purpose epithet favored by those unable to articulate a rational objection to their opponents' positions. Thus, defenders of prenatal children, especially if they reject most or all hard case wedge issues, are "extreme" while those who accept the destruction of prenatal children for any reason at any time are "enlightened", "tolerant", "defenders of freedom", etc. See also PROJECTION.
A supporter of extreme doctrines or practice; one who holds extreme opinions.
a person who holds extreme views
(used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative"