backward-looking ideology; conservatism
A formal, somewhat academic term for a philosophy or mindset that resists progress and clings to the past. Often used in political or social commentary.
I cannot agree with his backward-looking way of thinking.
That political party opposed reform under the banner of conservatism.
保守主義 is the standard term for political conservatism, while 退嬰主義 carries a stronger negative nuance of being regressive or reactionary.
復古主義 emphasizes a desire to return to an idealized past, whereas 退嬰主義 focuses more on a passive resistance to change.
Compound of 退嬰 (たいえい, 'withdrawal, regression') and 主義 (しゅぎ, '-ism'). The exact historical derivation is uncertain, but the term likely emerged in modern intellectual discourse.