IPA: //ʌnˈɑːrtɪstɪk//
KK: /ʌnˈɑːrtɪstɪk/
Not having or showing creativity or skill in art or design.
The painting was criticized for being unartistic and lacking imagination.
Unartistic → It is formed from "un-" (meaning not) and "artistic" (from Latin "artisticus", meaning relating to art). The word "unartistic" means not relating to or lacking in artistic qualities.
Think of 'not' ('un-') being added to 'artistic', which means relating to art — so unartistic describes something that lacks artistic qualities.