hello a gooner and nice to meet you radical can be defined as favoring or effecting fundamental or revolutionary changes in current practices conditions or institutions in this instance it is not being used pejoratively or as a critique but rather an accompanying term to signify that his ideology at this time had become crystallized and in its post arbenz state was indeed radical che himself never shunned away from acknowledging the radical nature of the transformational marxist world revolution which he believed was necessary and in fact saw the term if anything as a compliment do you have sources or reasoning for questioning whether guevara's ideology fits the definition of being radical