Factish

This factish, leftish derivation of the old dictum, “Art is art precisely in that it is not Nature,” by wrongly interpreting the word Nature, utterly betrayed the master's poetic sense.

Source: wiktionary

And as Miller writes of Holy Blood, Holy Grail, its real bits are 'factish' rather than 'factual.'

Source: wiktionary

all very abstract and not too consistent in view of Hardy's own stories, which were even at that time so seriously attacked, on one side by the realists because they were said to be too unreal, and on the other by the idealists because they were too nakedly factish.

Source: wiktionary

There is no doubt a strong tendency to revolt against abstract reasoning. Human nature has a strong “factish” element in it.

Source: wiktionary