lackluster
US /ˈlækˌlʌs.tɚ/
UK /ˈlækˌlʌs.tɚ/

1.
lacking in vitality, force, or conviction; uninspired or uninspiring
:
•
The team gave a lackluster performance in the first half.
•
Despite the grand setting, the play itself was rather lackluster.