IPA: //ʌnˈɑːrtfəl//
KK: /ʌnˈɑrtfəl/
Not having skill or creativity; clumsy or awkward in style or execution.
The unartful design of the building made it look unattractive.
Unartful → It is formed from "un-" (meaning not) and "artful" (from Old French *artful*, meaning skillful or clever). The word "unartful" means not skillful or lacking in artfulness.
Think of 'not' ('un-') being added to 'skillful' ('artful') — that's why unartful means lacking skill or cleverness.