IPA: /dɪsˈsætɪsfæktəri/
KK: /dɪsˈsætɪsfæktəri/
Not meeting expectations or standards; inadequate or poor in quality.
The service at the restaurant was dissatisfactory, leading to a complaint.
Dissatisfactory → It is formed from "dis-" (meaning not) and "satisfactory" (from Latin "satisfacere", meaning to make sufficient or to satisfy). The word "dissatisfactory" means not sufficient or not satisfying.
Think of 'not' ('dis-') being added to 'sufficient' or 'satisfying' — that's why dissatisfactory means something that does not meet expectations.