nonfestive
/ˌnɒnˈfɛs.tɪv/ or /ˌnoʊnˈfɛs.tɪv/Definitions
1. adjective
lacking or uncharacteristic of festive spirit or atmosphere
“The nonfestive office decorations were a disappointment to the employees.”
2. noun
a period or atmosphere lacking festive spirit or atmosphere
“The entire town was in a nonfestive mood due to the ongoing economic crisis.”