shallow
US /ˈʃæl.oʊ/
UK /ˈʃæl.oʊ/

1.
of little depth
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The children were playing in the shallow end of the pool.
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The river is very shallow at this point.
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2.
not exhibiting or requiring much thought, analysis, or intellect; superficial
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His arguments were rather shallow and unconvincing.
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She found his personality to be quite shallow.
1.
to make something shallow
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The constant erosion will eventually shallow the riverbed.
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Dredging is needed to prevent the harbor from becoming too shallow.