of little depth; not deep

shallow water.

lacking depth; superficial

a mind that is not narrow but shallow.

taking in a relatively small amount of air in each inhalation

shallow breathing.

Baseball . relatively close to home plate

The shortstop caught the pop fly in shallow left field.

Usually, shallows. ( used with a singular or plural verb ) a shallow part of a body of water; shoal.

Baseball . at a shallow position

With the pitcher up, the outfielders played shallow.

to make or become shallow.