na-adjective
Describes a person, ideology, or policy that opposes social or political change and seeks to return to a previous state. Often used in political contexts.
彼の考え方はとても反動的だ。
His way of thinking is very reactionary.
その政治家は反動的な政策を提
That politician proposed reactionary policies.
Derived from 反動 (reaction, backlash) + 的 (-like, -ish). The word 反動 itself is composed of 反 (anti-, reverse) and 動 (movement).