Main entry: superficiality, shallowness
Definition: lack of depth of knowledge or thought or feeling
Antonyms: profoundness, profundity
Definition: intellectual depth; penetrating knowledge; keen insight; etc
Main entry: shallowness
Definition: the quality of lacking physical depth
Usage: take into account the shallowness at that end of the pool before you dive
Antonyms: deepness, profoundness, profundity
Definition: the quality of being physically deep