When describing a person, how is meaning of the word cheap

different from the meaning of the word frugal?

Not getting your mom a gift for her birthday - that's just cheap. Thrifty, spartan, and prudent are synonyms for frugal, a word that often has positive connotations when used to describe a person who lives a simple life ... The word is from Latin frux, meaning "fruit" (in the sense of "profit").