ersprightly
Ersprightly is a term that appears to be a portmanteau, blending the word "ersatz" with "sprightly". Ersatz refers to a substitute or imitation, often of inferior quality. Sprightly means lively, full of energy, and animated. Therefore, "ersprightly" could be interpreted as a description of something that is a substitute or imitation, but which possesses a certain liveliness or apparent energy, perhaps deceptively so.
The term does not appear in standard dictionaries or widely recognized literature, suggesting it is likely
Another interpretation could be a playful or ironic description of something that is trying to appear lively