Adjective
Informed by insufficient reading; superficial; shallow.
Source: Webster's dictionaryBallycumber (ba-li-KUM-ber) n. One of the six half-read books lying somewhere in your bed. Douglas Adams
As it was, I couldn't escape the feeling that I was out of my element. I found myself thinking of a book I'd left half-read at home and wishing I'd stuck it in my purse so I could pull it out now. Charlaine Harris