shallow (adj.)

c. 1400, schalowe "not deep," probably from or related to Old English sceald (see shoal (n.)). Of breathing, attested from 1875; of thought or feeling, "superficial," by 1580s. The noun, usually shallows, is first recorded 1570s, from the adjective.

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Definitions of shallow from WordNet
shallow (adj.)
lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center;
a shallow cut
established a shallow beachhead
a shallow dish
hit the ball to shallow left field
a shallow closet
shallow water
shallow (adj.)
not deep or strong; not affecting one deeply;
in a shallow trance
shallow breathing
a night of shallow fretful sleep
shallow (adj.)
lacking depth of intellect or knowledge; concerned only with what is obvious;
shallow people
his arguments seemed shallow and tedious
shallow (v.)
make shallow;
The silt shallowed the canal
Synonyms: shoal
shallow (v.)
become shallow;
the lake shallowed over time
Synonyms: shoal
shallow (n.)
a stretch of shallow water;
Synonyms: shoal