The sentence with the most precise language is "The enormous cloud obscured the nobody sun." While it has some unusual phrasing ("nobody sun"), the words "enormous" and "obscured" are specific descriptors. However, it's worth noting that this sentence contains a typographical error and might not convey a clear meaning as intended.
If you are looking for clarity and precision without errors, then "the play was pretty good, if a bit long" could also be considered, as it provides a clear and specific opinion about the quality and length of the play, despite the more subjective use of "pretty good."
Ultimately, for clarity in meaning, "the play was pretty good, if a bit long" is the most precise choice among the options.