IPA: /ɪˈfɛtənɪs/
KK: /ɪˈfɛtənɪs/
The quality of being weak, ineffective, or worn out, often due to overuse or excessive indulgence.
The effeteness of the once-great empire was evident in its inability to defend itself.
Effeteness is formed from "effete" (from Latin "effetus", meaning exhausted or worn out) and the suffix "-ness" (meaning the state or quality of). The word describes the state of being exhausted or lacking in vitality.
Think of 'effete' meaning exhausted, and remember that 'effeteness' refers to the state of being worn out or lacking energy.