- The definition of inadequate is someone or something that is lacking in something desired or required.
An example of something that would be described as inadequate is a broken down car that won't run.
As a means of transportation, this car is inadequate.
inadequate definition by Webster's New World
not adequate; not sufficient; not equal to what is required
inadequate definition by American Heritage Dictionary
Not adequate to fulfill a need or meet a requirement; insufficient.
- in·adˈe·quate·ly adverb