IPA: /dɪˈkrɛpɪtjuːd/
KK: /dɪˈkrɛpɪtud/
The state of being old and weak, often due to age or long use, which makes someone or something less effective or strong.
The decrepitude of the old building was evident in its crumbling walls and broken windows.
Decrepitude → It is formed from "decrepitus" (from Latin, meaning worn out or old) and the suffix "-tude" (meaning state or condition). The word "decrepitude" refers to the state of being worn out or weakened due to age.
Think of someone who is 'worn out' ('decrepitus') and in a 'state' ('-tude') of decline — that's what decrepitude means.
No commonly confused words.