A movement towards the reversal of an existing tendency or set of circumstances, esp. in politics. Also (and now usually) as a mass noun: advocacy…

Partiality for, or inclination to maintain, the existing state of affairs.

Advocacy of or support for retrogression; extreme conservatism; the adoption of a reactionary attitude.

Reactionary principles or practice.

Dislike of novelty.

= reactionism, n.

The quality or condition of being reactionary; reactionary character.

= blimpery, n. Also more fully Colonel Blimpism.

An attitude or outlook that pompously and peremptorily rejects social change, new ideas, etc., in the manner of Colonel Blimp (see blimp, n.2)…

A policy or attitude of extreme conservatism or opposition to progress.

figurative. Rigidity, excessive resistance to change.