Is there a word for people incapable of thinking?

Is there a word for people incapable of thinking?

That is the way it is done since ever. Some offer simplifications: they are, though, for people incapable of thinking.

Is there a word to express that equivalently (or close to equivalently)? The sentence should look like something like this, with _^ADJECTIVE standing in for the desired word (however, variations will also be considered):

[. . .] they are, though, for _^ADJECTIVE people.

To clarify, the wanted meaning surely wants to “attack” or to “strike” the addressees but without degenerating into vulgar insults, thus maintaining its fine and elegant form.

Solution 1:

How about imbecilic?

Imbecilic: a person considered foolish or stupid.

A somewhat less offensive term might be unreasoning.

Unreasoning: not reasoning or exercising reason; thoughtless; irrational.

Although perhaps unreasonable is more suited to your incapable criterion.

I had another idea: whilst it doesn't really convey a connotation of incapability, a word which is often used in such circumstances is thoughtless.

Marked by or showing lack of due forethought or care; careless: a thoughtless mistake; a thoughtless bumbler.

Lacking thought: staring blankly in a thoughtless daze.

All definitions from thefreedictionary.com

Solution 2:

brain-dead should work (since I see the pejorative tag)

(humorous) very stupid and boring; not intelligent (Oxford)

Edit: A more elegent term for the same idea would be

anencephalous

anencephaly: congenital absence of part or all of the brain. (Dictioary.com)

Solution 3:

Thoughtless come to mind. Merriam Webster:

2 : devoid of thought : insensate

Insensate is a 4 bit word, while thoughtless only costs a nickel.

Solution 4:

A very literal word would be vegetative:

characterized by, resulting from, or being a state in which there is total loss of cognitive functioning and in which only involuntary bodily functions (as breathing or blinking of the eyes) are sustained (Merriam-Webster online)

This is a technical word but related to veg out:

to relax in a mindless way (usually followed by out): We vegged out all weekend, watching the soccer channel and ordering pizza. Tonight I'll go home and veg with a good book. (reference.com)

This is apparently cited as early as 1990 in the film Pretty Woman: "Let's watch old movies all night... we'll just veg out in front of the TV" (source: phrases.org.uk).

A more pejorative word for a person whose brain seems to be switched off is simply to call them a vegetable, particularly a mindless vegetable.