lurking
(verb) remaining hidden so as to wait in ambush
terrorist
(noun) a person who uses unlawful violence and intimidation, especially against civilians, in the pursuit of political aims
militant
(noun) combative and aggressive person in support of a political or social cause, and typically favoring extreme, violent, or confrontational methods
wavering
(adjective) moving in a quivering way; flickering
guerrilla
(noun) a member of a small independent group taking part in irregular fighting, typically against larger regular forces
martyr
(noun) a person who is killed because of their religious or other beliefs