IPA: /ˌɪnəˈkwædɪtli/
KK: /ɪnˈædɪkwətli/
In a way that is not enough or not sufficient for a particular purpose.
The project was inadequately funded, leading to many problems.
Inadequately → It is formed from "in-" (meaning not) and "adequatus" (from Latin, meaning adequate or sufficient) and the suffix "-ly" (meaning in a manner). The word "inadequately" means in a manner that is not sufficient or not enough.
Think of 'not' ('in-') being combined with 'sufficient' ('adequatus') to remember that 'inadequately' means something is done in a way that is not enough.