We're becoming, in a word, shallower.

I've read some of his books –they're very shallow.

Acquaintance as shallow as that with the news is probably no great loss to society; Pew surveys of general knowledge suggest that young people are about as well (or badly) informed as they used to be.

Marriage in the west is rooted in romantic passion, and although that passion evolves over time we basically assume that if it's is gone from marriage it's a shallow marriage.

He has a very meagre knowledge of history.