Definition of «lack depth»

The phrase "lack depth" means that something is shallow, lacking complexity, or doesn't have much substance or profoundness to it.

The entire list of candidates lacks the depth of the party. (labour-uncut.co.uk)
The Protestant critical consciousness was academically helpful, but Protestant worship life lacked depth for me. (religion-online.org)
Endless mode is new and provides an interesting challenge, but it still lacks depth now that gold is the only real reward. (cogconnected.com)
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