Ideological means driven by a system of political or social beliefs. An ideological divide, ideological purity, ideologically driven.
It is nearly always used of the other side, since your own position is principle and theirs is ideology. Calling a decision ideological says it was made from doctrine rather than from evidence.
1adjectiveideologicalDriven by a system of political or social beliefs.
“The two parties have deep ideological differences about the role of the state.”
ideological is a quality.
French
idéologie
English
ideology
English, today
ideological
From ideology + -ical. ideology French idéologie, from idéo- + -logie (equivalent to English ideo- + -logy). Cognate with, but not derived from, idea. Coined 1796 by Antoine Destutt de Tracy. Modern sense of “doctrine” attributed to use of related idéologue (“ideologue”) by Napoleon Bonaparte as a term of abuse towards political opponents in early 1800s.
Etymology from Wiktionary, CC BY-SA