Definition of shallower:
(adj) :
Having little depth; significantly less deep than wide.
(adj) :
Extending not far downward.
(adj) :
Concerned mainly with superficial matters.
(adj) :
Lacking interest or substance; flat; one-dimensional.
(adj) :
Not intellectually deep; not penetrating deeply; simple; not wise or knowing.
(v) :
(ambitransitive) To make or become less deep.