IPA: /ˌɪndɪˈspoʊzd/
KK: /ɪndɪˈspoʊzd/
Not feeling well or being unwilling to do something; slightly ill or averse to something.
She was indisposed and couldn't attend the meeting.
Indisposed is formed from "in-" (meaning not) and "disposed" (from Latin "disponere", meaning to arrange or set in order). The word indicates a state of being not arranged or set in order, often referring to being unwell or unable to do something.
Think of being 'not' ('in-') 'arranged' or 'set in order' ('disposed') — that's why indisposed means being unable to do something, often due to illness.