The Only Use of

crass
in
Middlemarch

There were many crass minds in Middlemarch whose reflective scales could only weigh things in the lump; and they had a strong suspicion that since Mr. Bulstrode could not enjoy life in their fashion, eating and drinking so little as he did, and worrying himself about everything, he must have a sort of vampire's feast in the sense of mastery.†
Chpt 2

Definition:

(of persons) so unrefined as to be lacking in discrimination and sensibility