IPA: //ʌnˈdaɪdæktɪk//
KK: /ʌnˈdaɪdæktɪk/
Not intended to teach or instruct; lacking educational purpose.
The film was entertaining but completely undidactic, offering no lessons or moral guidance.
This word originates from the Greek 'didaktikos' (meaning instructive or teaching) with the prefix 'un-' (meaning not). The word 'undidactic' means not instructive or not intended to teach.
Think of 'not' ('un-') being added to 'instructive' ('didaktikos') — that's why 'undidactic' means something that does not teach.