IPA: //ʌnˈsɪnəˌmætɪk//
KK: /ʌnˈsɪnəˌmætɪk/
Not related to or characteristic of cinema or film; lacking the qualities that make something suitable for a movie.
The documentary was criticized for its uncinematic style, which felt more like a lecture than a film.
Uncinematic → It is formed from "un-" (meaning not) and "cinematic" (from Greek "kinema", meaning movement, and the suffix "-ic", meaning pertaining to). The word "uncinematic" means not pertaining to or characteristic of cinema or film.
Think of 'not' ('un-') being applied to something related to 'movement' ('kinema') in film — that's why 'uncinematic' means not related to cinema.