IPA: /ˌɪndɪspəˈzɪʃən/
KK: /ɪndɪspəˈzɪʃən/
A slight illness or a feeling of being unwell, often temporary. It can also refer to a lack of willingness to do something.
She stayed home from work due to her indisposition.
Indisposition is formed from "in-" (meaning not) and "dispositio" (from Latin, meaning arrangement or condition). The word refers to a state of being not in the usual condition, often implying illness or discomfort.
Think of being 'not' ('in-') in a good 'condition' ('dispositio') — that's why indisposition means feeling unwell or out of sorts.