unzealous

/ʌnˈzɛləs/
adjective
  1. Not showing great energy, enthusiasm, or dedication; lacking zeal.
    • She gave an unzealous wave, barely lifting her hand.
    • The volunteers were unzealous about the early morning cleanup.
    • His unzealous attitude toward the project worried the team leader.
Antonyms
What does "unzealous" mean? | whatsthatwordmean | whatsthatwordmean