When it comes to describing something as "boring in the lathe," there are several synonyms that can be used to convey this idea. One such synonym is "tedious," which implies that the task at hand is long, drawn-out, and lacking in excitement or interest. Another synonym is "monotonous," which suggests a lack of variety or change in the activity being performed. "Dull" is also a fitting synonym, as it indicates a lack of excitement or entertainment. Finally, "uninteresting" is a synonym that highlights the lack of appeal or fascination in the task being carried out. In any case, the common thread among these synonyms is a sense of tedium and boredom that can set in during repetitive tasks such as those performed on a lathe.