Shallow – (Relating to a person) Not capable of serious thought

(Pronounced shal-oh)

Note: we all know the meaning of a shallow depth of water and so this can be used to remember that shallow also means "Not capable of serious thought" as follows:

To remember the definition of the word shallow, use the following mnemonic:

It was a shallow pond and the diver looked like she was incapable of thinking through the problem.

Examples of shallow in a sentence

While he was a nice enough person, he had a very shallow mind and couldn't hold a serious conversation.

She had a sharp mind but due to her appearance many people passed her off as being shallow.

He was a very shallow individual and should never have been given such a critical role, now the entire project was in ruins.