shallow

adjective

1
lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center
shallow water
a shallow dish
2
not deep or strong; not affecting one deeply
shallow breathing
a night of shallow fretful sleep
3
lacking depth of intellect or knowledge; concerned only with what is obvious
shallow people
his arguments seemed shallow and tedious

Also useful for “shallow”:Unscrambler— Rearrange the letters in “shallow”