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Shallow

/ˈʃæləʊ/

Not deep; having little depth from the top to the bottom.

Synonyms:

The water is shallow near the beach.He has a shallow understanding of the subject.

Originated from Old English sceald, corresponding to Old Norse skald, meaning shallow sea or bay, and further linked to German schall.

13 mentions per 1 million words

Moderate

Hint: Frequency according to COCA