1.Definition: lacking depth of intellect or knowledge; concerned only with what is obvious
"Shallow people", "His arguments seemed shallow and tedious"
2.Definition: 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", "A shallow cut", "A shallow closet", "Established a shallow beachhead", "Hit the ball to shallow left field"
3.Definition: not deep or strong; not affecting one deeply
"Shallow breathing", "A night of shallow fretful sleep", "In a shallow trance"