How would you define a person characterized by ordinariness and lack of distinction?

The term "mediocre" accurately describes a person who embodies ordinariness and lacks distinction. It conveys a sense of being average or unremarkable, highlighting an absence of exceptional qualities or achievements. In this context, a mediocre person does not stand out in any significant way and may be seen as typical or pedestrian, rather than extraordinary or noteworthy.

The other options carry different connotations. "Obsessional" refers to being preoccupied or obsessive, suggesting a focus or fixation that diverts from ordinariness. "Provincial" implies a narrow-mindedness or lack of sophistication often associated with rural or less cosmopolitan backgrounds, which does not necessarily equate to mere ordinariness. Meanwhile, "artful" denotes cleverness or skill, especially with an implication of deceit or craftiness, contrasting sharply with the idea of lack of distinction. Hence, "mediocre" is the most fitting choice to define a person characterized by ordinariness.