IPA: /ɪnˈædɪkwət.nəs/
KK: /ɪnˈædɪkwətnəs/
The state of being insufficient or not good enough for a particular purpose or requirement.
The inadequateness of the resources led to project delays.
Inadequateness → It is formed from "in-" (meaning not) and "adequate" (from Latin "adaequatus", meaning equal to or sufficient) and the suffix "-ness" (meaning the state of being). The word "inadequateness" refers to the state of not being sufficient or not meeting a required standard.
Think of 'not' ('in-') being combined with 'sufficient' ('adequate') to remember that 'inadequateness' means the state of not being sufficient.