His knowledge of the subject is broad and shallow.
broad and shallow
idiomAssociated with the Broad Church; latitudinarian.
The professor criticized the student's essay for being broad and shallow, noting that it lacked the necessary depth of research.
While the lecture was intended to be an introduction, the audience found the presentation too broad and shallow to provide any meaningful academic insight.
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broad brush
A style or approach that deals with something in very general, sweeping terms, without attention to fine details or subtle nuances.
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broad in the beam
Wide across the hips, with large buttocks.
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broad shoulders
the ability to take criticism, or accept responsibility.
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broad strokes
Major features or key points; outline.
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not be able to hit the broad side of a barn
To have very poor aim, such as while using firearms or in sports.
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paint with a broad brush
To describe a class of objects or a kind of phenomenon in general terms, without specific details and without attention to individual variations.